Answer:
36
Step-by-step explanation:
1. 48 divided by 3= 12
2. 12 x 3= 36
Is the following statement true or false
Answer:
Step-by-step explanation:
The answer is true because AB intersects with AC at point A
The answer is True because they both cross over a line
A population of 430,000 toads is expected to shrink at a rate of 5.5% per year. Which is the best prediction for the toad population in 14 years?
A. 236,500
B. 194,766
C. 59,125
D. 13,821
B would be the correct answer
Answer:
k12 wrap up
Step-by-step explanation:
1.549756
2. 6 months
3. 194766
4. 2037
5. 33mg
Factor completely, then place the factors in the proper location on the grid.
3y 2 +7y + 4
Answer:
(3y + 4)(y + 1)
Step-by-step explanation:
3y^2 +7y + 4
a = 3, b = 7 and c = 4
ac = 3 x 4 = 12
The products of 12 = 3 and 4 and sum of 3 and 4 = 7
So
3y^2 +7y + 4
= 3y^2 + 3y + 4y + 4
= 3y(y + 1) + 4(y + 1)
= (3y + 4)(y + 1)
Answer
(3y + 4)(y + 1)
Answer:
So the factors are (y + 1)(y + 4/3)
Step-by-step explanation:
Given in the question an equation
3y² + 7y + 4
To find it's factor we will use quadratic formula
y = -b ± √(b²-4(a)(c)) / 2a
here a = 3
b = 7
c = 4
y1 = -7 + √(7²- 4(3)(4)) / 2(3)
= -7 + √49 - 48 / 6
= -7 + 1 /6
= -6/6
= -1
y2 = -7 - √(7²- 4(3)(4)) / 2(3)
= -7 - √49 - 48 / 6
= -7 - 1 /6
= -8/6
= -4/3
So the factors are (y + 1) and (y + 4/3)
Harry invests £6000 into a savings account
The account pays 3.4% compound interest per year
Work out the value of his investment after 3 years
Give your answer to the nearest penny
➷ Find the multiplier:
1 + (3.4/100) = 1.034
Use this formula:
Final = original x multiplier^n
n is the number of years
Substitute the values in:
final = 6000 x 1.034^3
Solve:
final = 6633.0438
This can be rounded to the final answer of £6633.04
✽➶ Hope This Helps You!
➶ Good Luck (:
➶ Have A Great Day ^-^
↬ ʜᴀɴɴᴀʜ ♡
Answer:
THX THIS HELPED ME A LOT
Step-by-step explanation:
Factor q^3-125 completely.
The expression [tex]\(q^3 - 125\)[/tex] can be completely factored as [tex]\((q - 5)(q^2 + 5q + 25)\)[/tex] using the difference of cubes formula, where [tex]\(q\)[/tex] is the variable and 5 is the cube root of 125.
The given expression [tex]\(q^3 - 125\)[/tex] can be factored using the difference of cubes formula, which is[tex]\(a^3 - b^3 = (a - b)(a^2 + ab + b^2)\)[/tex]. In this case, [tex]\(a = q\)[/tex] and [tex]\(b = 5\)[/tex], as [tex]\(125 = 5^3\)[/tex].
Applying the difference of cubes formula, the factorization becomes:
[tex]\[ q^3 - 125 = (q - 5)(q^2 + 5q + 25) \][/tex]
This is the complete factorization of [tex]\(q^3 - 125\).[/tex]
The question probable may be:
Factorize: [tex]q^3[/tex]-125
The expression q^3-125 is factored completely as (q - 5)(q^2 + 5q + 25), using the difference of cubes formula.
Explanation:To factor the expression q^3-125 completely, we recognize that it represents a difference of cubes since 125 is a perfect cube (5^3).
The difference of cubes can be factored using the formula a^3 - b^3 = (a - b)(a^2 + ab + b^2). In our case, a = q and b = 5.
The factored form of the expression is therefore (q - 5)(q^2 + 5q + 25).
Remember that factoring expressions is essential for simplifying equations and solving algebraic problems efficiently.
A government agency has specialists who analyze the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. In standard English text, a particular letter is used at a rate of 5.7%. a. Find the mean and standard deviation for the number of times this letter will be found on a typical page of 1600 characters. muequals 91.2 (Do not round.) sigmaequals 9.3 (Round to one decimal place as needed.) b. In an intercepted message, a page of 1600 characters is found to have the letter occurring 102 times. Is this unusual?\
Answer:
A) μ = 91.2; σ = 9.3
B) No
Step-by-step explanation:
To find the mean, μ, we use the formula
μ = np, where n is the sample size and p is the probability of success (percentage of times the letter is used).
This gives us
μ = 0.057(1600) = 91.2
To find the standard deviation, we use the formula
σ = √(np(1-p)
This gives us
σ = √(1600×0.057×(1-0.057))
= √(1600×0.057×0.943) = √86.0016 = 9.2737 ≈ 9.3≈
Any value that is more than two standard deviations from the mean is considered unusual. The value 102 is
(102-91.2)/9.3 = 10.8/9.3 = 1.16 standard deviations from the mean. This is not statistically unusual.
Calculations were made based on standard English language letter frequencies to establish a mean and a standard deviation for a set number of letters. In this example, an occurrence was not considered unusual as it was within one standard deviation of the mean.
Explanation:The subject revolves around probability and statistics and involves the calculation of the mean and standard deviation, and understanding of what might be considered an unusual result in a statistical sense.
In standard English text, a particular letter is used at a rate of 5.7%. This means on average, the letter will appear approximately 5.7% of the time. If each page consists of 1600 characters, then the mean (Μ) number of times that this letter will appear on a page can be calculated by multiplying the total characters by the usage rate (1600 * 0.057 = 91.2).
The standard deviation (sigma) is given as 9.3. This measure shows the dispersion or how spread out the numbers are from the mean.
In the intercepted message, the letter occurred 102 times. To determine if this is unusual, we look at how many standard deviations away from the mean this number falls. If it falls within 2 standard deviations (2 * 9.3 = 18.6) of the mean, it is not unusual. 102 is approximately one standard deviation above the mean (102 - 91.2 = 10.8), therefore, it is not considered an unusual occurrence.
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Manager 1 has 7 years of service, averaged $5000 per day in sales, had a customer Service Rating of 5 and had 83% of projects completed on time.
u didnt ask a question here you dummy thicc sassy block of cheesy
Manager 1, with 7 years of service, achieved an average daily sales of $5,000, maintained a high customer service rating of 5, and successfully completed 83% of projects on time Business involves the production, exchange, or provision of goods and services in pursuit of profit, contributing to economic growth and sustainability.
Manager 1's performance is evaluated based on several key metrics. First, their 7 years of service indicate experience and commitment to the company. Second, the daily sales average of $5,000 reflects their effectiveness in generating revenue. The customer service rating of 5 signifies exceptional customer satisfaction, indicating effective communication and problem-solving skills. Lastly, the 83% on-time project completion rate demonstrates efficiency in managing tasks and meeting deadlines. These attributes collectively suggest that Manager 1 is a valuable asset to the company, with a strong track record of delivering results and maintaining high standards of customer service.
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According to an airline, flights on a certain route are on time 85% of the time. Suppose 17 flights are randomly selected and the number of on-time flights is recorded. (a) Explain why this is a binomial experiment. (b) Find and interpret the probability that exactly 12 flights are on time. (c) Find and interpret the probability that fewer than 12 flights are on time. (d) Find and interpret the probability that at least 12 flights are on time. (e) Find and interpret the probability that between 10 and 12 flights, inclusive, are on time.
Answer:
a: It is binomial because it is either on time, or it's not. There are only 2 choices
b: 0.0668
c: 0.0319
d: 0.9681
e: 0.097
Step-by-step explanation:
The formula (nCr)(p^r)(q^(n-r)) will tell us the probability of binomial events occuring. n is the population, r is the desired number of chosen outcomes, p is the probability of success, and q is the probability of failure. nCr tells us how many different ways we can choose r items from a total of n outcomes
Here, n = 17, p = 0.85, q = 0.15 and r depends on the question.
b. r = 12, plug in the values into the formula...
(17C12)(0.85^12)(0.15^5) = 0.0668
c. Use the compliment: the probability of fewer than 12 means 1 - P(12 or more), so 1 - (the sum of the probabilities or 12, 13, 14, 15, 16, or 17 flights being on time). This will save some time when calculating...we have
1 - [ (17C12)(0.85^12)(0.15^5) + (17C13)(0.85^13)(0.15^4) + (17C14)(0.85^14)(0.15^3) + (17C15)(0.85^15)(0.15^2) + (17C16)(0.85^16)(0.15^1) + (17C17)(0.85^17)(0.15^0) ]
= 1 - 0.9681 = 0.0319
d: this is what we just calculated before subtracting from 1 in the last problem, 0.9681
e. This is the probability of 10, 11, or 12 flights being on time
(17C10)(0.85^10)(0.15^7) + (17C11)(0.85^11)(0.15^6) + (17C12)(0.85^12)(0.15^5)
= 0.97
This question deals with the concept of binomial distribution. The situation of selecting 17 flights and recording if they are on time is a binomial experiment as it meets the required conditions. The probabilities for the various scenarios can be calculated using the binomial probability formula.
Explanation:This question pertains to the topic of binomial distribution in probability statistics. A binomial experiment is defined as a statistical experiment that meets specific parameters, such as a fixed number of trials with two potential outcomes (often defined as success and failure), and each trial is independent while repeated under identical conditions.
(a) The situation described - selecting 17 flights and recording whether they are on time or not - represents a binomial experiment because it satisfies these conditions. There are a fixed number of trials (17 flights), there are two outcomes (the flight is on time, or it's not), and each flight is an independent occasion.
(b) The probability of exactly 12 flights being on time can be calculated using the binomial probability formula: P(X=k) = C(n, k) *[tex](p^k) * ((1-p)^(n-k)).[/tex]Here, n=17, k=12, p=0.85 (the probability of a flight being on time).
(c), (d), (e) The probabilities that fewer than 12 flights are on time, at least 12 flights are on time, and between 10 and 12 flights (inclusive) are on time can also be calculated using the binomial formula, varying the value of k as required.
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Solve each equation (quadratic pattern)
[tex]2^{2x} -2^{x} =12[/tex]
[tex]3^{2x} + 3^{x+1} =4[/tex]
[tex]4^{x} + 6[/tex] · [tex]2^{x} +8 = 0[/tex]
[tex]9^{x} = 3^{x} +6[/tex]
Answer: x = 2
Step-by-step explanation:
[tex]2^{2x}-2^x-12=0\\\\\text{Let u = }2^x\\\\u^2-u-12=0\\(u-4)(u+3)=0\\\\u-4=0\quad and\quad u+3=0\\u=4\qquad and\quad u=-3\\\\\text{Substitute u with }2^x\\2^x=4\qquad and \quad 2^x=-3\\2^x=2^2\quad and\quad \text{not possible}\\\boxed{x=2}[/tex]
********************************************************************************
Answer: x = 0
Step-by-step explanation:
[tex]3^{2x}+3^{x+1}-4=0\\\\3^{2x}+3^x\cdot3^1-4=0\\\\\text{Let u = }3^x\\u^2+3u-4=0\\\\(u+4)(u-1)=0\\\\u+4=0\quad and\quad u-1=0\\u=-4\qquad and\quad u=1\\\\\text{Substitute u with }3^x\\3^x=-4\qquad and\quad 3^x=1\\\text{not possible}\ and\quad 3^x=3^0\\.\qquad \qquad \qquad \qquad \boxed{x=0}[/tex]
********************************************************************************
Answer: No Solution
Step-by-step explanation:
[tex]4^x+6\cdot 2^x+8=0\\\\2\cdot 2^x+6\cdot 2^x+8=0\\\\\text{Let u = }2^x\\2u+6u+8=0\\8u+8=0\\8u=-8\\u=-1\\\\\text{Substitute u with }2^x\\2^x=-1\\\text{not possible}[/tex]
********************************************************************************
Answer: No Solution
Step-by-step explanation:
[tex]9^x=3^x-6\\\\3\cdot 3^x=1\cdot 3^x-6\\\\\text{Let u = }3^x\\\\3u=u-6\\2u=-6\\u=-3\\\\\text{Substitute u with }3^x\\3^x=-3\\\text{not possible}[/tex]
A real estate broker's base salary is $18,000. She earns a 4% commission on total sales. How much must she sell to earn $55,000 total?
The salary of the real estate broker = $18,000
Commission earned on total sales = 4% or 0.04
Total income earnings = $55,000
Let the total sales be = x
Equation becomes :
[tex]18000+0.04x=55000[/tex]
[tex]0.04x=55000-18000[/tex]
[tex]0.04x=37000[/tex]
[tex]x=925000[/tex]
Hence, the real estate broker must sell $925,000 worth of real estate to earn $55,000.
1. List the steps that should be used to solve the equation (f)x=g(x) by graphing when F(x)=(1/2)^x-3 and g(x)=3x+5
Answer: Step 1 : make a table with one side being f(x) and the other being g(x)
step 2 graph the equtaions
step 3: give the x value of point of intersection
Step-by-step explanation:
PLEASE HELP WILL GIVE BRAINLIEST
What is the point and slope of the line represented by the equation below?
y + 3 = -2(x - 8)
A. slope = -2; point = (8, -3)
B. slope = -2; point = (3, -8)
C. slope = -2; point = (-8, 3)
D. slope = 2; point = (-3, 8)
Answer:
A. slope = -2; point = (8, -3)
Step-by-step explanation:
Compare to the point-slope form for slope m and point (h, k).
y -k = m(x -h)
You see that k = -3, m = -2, h = 8, so ...
the slope is -2the point is (h, k) = (8, -3)Whats the distance between the 2 points? (use Pythagorean Theorem)
Your horizontal value (x) is 3 because 5.5-2.5 = 3
Your vertical value (y) is 3.5 because 4.5-1 = 3.5
Pythagoras Theorem
[tex]c^{2}= \sqrt{a^{2}+b^{2} }[/tex]
a = 3
b = 3.5
[tex]c^{2}= \sqrt{3^{2}+3.5^{2} }[/tex]
c = 4.60977222
c = 4.61 to 2d.p.
One month, 24 employees earned a bonus and 56 employees didn't earn one. Express the number of employees who received the bonus as an unsimplified ratio to the number of employees who didn't receive the bonus. A. 56:80 B. 24:80 C. 56:24 D. 24:56
The answer would be D. 24:56 because you are comparing the people who got bonus (24) to the people who didn't (56)
A pyramid has a square root base with an area of 169ft.2 What is the perimeter of the base of the pryamid?
Answer:338
Step-by-step explanation:
169/2 = 84.5 (base is 84.5) 84.5 * 4 (sides) = 338
The perimeter of the square base is: 4 x 13 ft = 52 ft.
To find the perimeter of the square base of the pyramid, we first need to determine the length of one side of the square. Since the area of the square base is given as 169 square feet, we calculate the side length by taking the square root of the area.
The square root of 169 ft2 is 13 ft. Because a square has four equal sides, the perimeter of the square base is 4 times the length of one side.
Therefore, the perimeter of the square base is: 4 x 13 ft = 52 ft.
please help, show all work, asappp
Find the slope through the points (12, -18), (11,12)
Find the slope through the points (-18, -20), (-18, -15)
Find the X and Y intercepts: 4x + y = 5
Find the X and Y intercepts: y = 5x - 4
Write the equation of the line with a slope of zero and the point (3,4)?
What is the slope of the line x = 1?
QUESTION 1
We want to find the slope through the points (12,-18), (11,12).
We use the slope formula,
[tex]m = \frac{y_2-y_1} {x _2-x_1} [/tex]
We substitute the points to get,
[tex]m = \frac{12 - - 18}{11 - 12} [/tex]
[tex]m = \frac{30}{ - 1} = - 30[/tex]
The slope is -30.
QUESTION 2.
We want to find the slope through the points (-18, -20), (-18, -15).
We use the slope formula again to obtain,
[tex]m = \frac{ - 15 - - 20}{ - 18 - - 18} [/tex]
We simplify to get;
[tex]m = \frac{5}{0} [/tex]
Division by zero means the slope is not defined.
QUESTION 3
The given equation is 4x + y = 5.
At x-intercept, y=0.
We put y=0 into the equation to get,
[tex]4x + 0 = 5[/tex]
[tex]4x = 5[/tex]
[tex]x = \frac{5}{4} [/tex]
The x-intercept is
[tex]( \frac{5}{4} , 0)[/tex]
To find the y-intercept,we substitute x=0 into the equation to get,
[tex]4(0) + y = 5[/tex]
[tex]y = 5[/tex]
The y-intercept is (0,5)
QUESTION 4.
The given equation is
[tex]y = 5x - 4[/tex]
To find the y-intercept put x=0 into the equation.
[tex]y = 5(0) - 4[/tex]
[tex]y = - 4[/tex]
(0,-4)
To find the x-intercept, put y=0,
[tex]0 = 5x - 4[/tex]
[tex]4 = 5x[/tex]
[tex] \frac{4}{5} = x[/tex]
[tex]( \frac{4}{5} ,0)[/tex]
QUESTION 5
To find the equation of a line given the slope m, and a point
[tex](x_1,y_1) [/tex]
we use the formula,
[tex]y-y_1=m(x-x_1)[/tex]
The given line has slope zero and passes through
(3,4)
The equation is
[tex]y - 4 = 0(x - 3)[/tex]
[tex]y - 4 = 0[/tex]
[tex]y = 4[/tex]
Question 6
The given equation is
[tex]x = 1[/tex]
This is the equation of a line that is parallel to the y-axis.
The slope of all lines parallel to the x-axis is undefined.
The slope of x=1 is not defined.
You have a fancy 2nd-floor room and need a new mattress. You need to bring your mattress in through the french doors on your balcony. Your french doors of the dimensions of 72 inches by 80 inches. What is the largest mattress that can fit diagonally? Round to the nearest tenth.
Here is your answer
[tex]\bold{107.62} inches [/tex]
Since the door will be in shape of a rectangle where,
length= 80 inches
breadth= 72 inches
So,
widht of largest mattress that can fit diagonally is diagonal of the door.
i.e.
[tex]d= \sqrt{{l}^{2}+{b}^{2}}[/tex]
[tex]d= \sqrt{{80}^{2}+{72}^{2}}[/tex]
[tex]d= \sqrt{6400+5184}[/tex]
[tex]d= \sqrt{11584}[/tex]
[tex]d= 107.62[/tex]
HOPE IT IS USEFUL
The largest mattress to fit diagonally through the french doors measuring 72 inches by 80 inches is approximately 107.6 inches, using the Pythagorean theorem to calculate it.
To find the largest mattress that can fit diagonally through french doors with dimensions of 72 inches by 80 inches, we can use the Pythagorean theorem because the door creates a right-angle triangle. The diagonal can be calculated using the formula: diagonal = \/(width² + height²).
We plug in the dimensions: diagonal = \/(72² + 80²). First, square each dimension: 72² = 5184 and 80² = 6400. Then add these together: 5184 + 6400 = 11584. Now take the square root of 11584 to find the diagonal: diagonal = \/11584 which is approximately 107.6 inches.
Therefore, the largest mattress that can fit diagonally through the french doors rounded to the nearest tenth is 107.6 inches.
If a equation of a line y=5x-3 is changed to y=1/5x-3, how is the graph effected? A.The line shifts up B.The line becomes steeper C.The line becomes less steep D.The line now decreases from left to right
Answer:
Option C.
Step-by-step explanation:
we have
[tex]y=5x-3[/tex] -----> equation of a line with slope [tex]m=5[/tex]
Is changed to
[tex]y=(1/5)x-3[/tex] ----> equation of a line with slope [tex]m=1/5[/tex]
Compare the slopes
The slope becomes smaller
therefore
The line becomes less steep
see the attached figure to better understand the problem
Given: X-5>-2
Choose the solution set.
{XIXER,X-7}
{XI XER, x>-3)
[XIXER, > 3)
{x|xer, x>7
answer X>-3 step by step explaination: change the signs of 5 move the constant to the right side cancel out the 5's -2 plus 5 is three so X>3 the third one
X>-3 change the signs of 5 move the it to the right side mark out the 5's -2 plus 5 is three so X>3 the third one
What is the parent function of the graph?
y = |x|
y = |x| + 4
y = |x – 4|
y = |x| – 4
It would be D. Because K represents the up or down part of the graph. The formula for parents function is (x+ or -h) +or-k. It does not show h being applied to the main point.
I hope this helps
The graph in blue is y = |x|-4 which is the result of shifting y = |x| four units down. The parent graph has the vertex at (0,0).
I am desperate 98 point for the person who answers this right Polynomials are a close/not closed system under addition and subtraction as are whole numbers and integers/all number/monomial/whole number. When you add or subtract polynomials you end up with other polynomial/whole number/integers/binomials.
Answer:
The whole numbers are closed under addition, which guarantees that the new exponents will be whole numbers. Consequently, polynomials are closed under multiplication. Polynomials are NOT closed under division.
Step-by-step explanation:
Example
What's the degree of the following polynomials?
x2+x
The first monomial has a degree of 2 and the second monomial has a degree of 1. The highest degree is 2 which mean that the degree of the polynomial is 2.
x4+x2+x
4, 2 and 1 , the highest degree is 4 which mean that the degree of the polynomial is 4.
We can add and subtract polynomials. We just add or subtract the like terms to combine the two polynomials into one.
Final answer:
Polynomials form a closed system under both addition and subtraction, meaning the result will always be another polynomial. The basic principle is combining like terms, observing the order of operations and the signs of coefficients.
Explanation:
Polynomials are a closed system under addition and subtraction, just as whole numbers and integers are. This means that when you add or subtract polynomials, the result is always another polynomial. The basic principle in working with addition and subtraction is to combine like terms while paying attention to the signs of the coefficients. When working specifically with whole numbers, you pay attention to maintaining the properties of closure, commutativity (e.g. A + B = B + A), and associativity.
As an example, when adding the polynomials (2x2 + 3x + 1) and (x2 - 4x + 5), you combine like terms to get another polynomial: 3x2 - x + 6. Similarly, subtracting (x - 3) from (2x2 + x + 1) results in the polynomial 2x2 - 2. The resulting expressions following these operations remain as polynomials, not turning into integers or any other type of number.
Find the slope for the following situations.
Given the equation y = 5x + 1
Determine whether the system of linear equations has one and only one solution, infinitely many solutions, or no solution. 2x − y = 2 3x + y = −6 one and only one solution infinitely many solutions no solution Find the solution, if one exists. (If there are infinitely many solutions, express x and y in terms of the parameter t. If there is no solution, enter NO SOLUTION.) (x, y) =
Answer:
Only one solution(x, y) = (-0.8, -3.6)Step-by-step explanation:
You know there is only one solution because the ratio of x- and y-coefficients is different in the two equations. That means the lines will have different slopes, so must intersect in exactly one point.
__
The y-coefficients are opposites, so you can eliminate the y-variable by adding the equations:
(2x -y) + (3x +y) = (2) + (-6)
5x = -4
x = -4/5 = -0.8
Substituting this into the second equation, we have ...
3(-0.8) +y = -6
y = -3.6 . . . . . . . add 2.4 to both sides
The solution is (x, y) = (-0.8, -3.6).
__
You can also find the solution by graphing (or using a graphing calculator).
The system of linear equations has one and only one solution, which is (x, y) = (-4/5, -18/5).
Explanation:This is a question about solving a system of linear equations. To determine whether a system has one, many, or no solutions, we add or subtract the equations to eliminate one of the variables, usually y or x.
Given the system of equations:
2x - y = 2
3x + y = -6
When we add the two equations together, we get 5x = -4, so x = -4/5.
Substitute x = -4/5 into the first equation to find y:
2(-4/5) - y = 2 => -8/5 - y = 2 => -y = 2 + 8/5 => y = -18/5.
Therefore, the system of equations has one and only one solution, which is (x, y) = (-4/5, -18/5).
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Write a number in which the digit 3 is ten times the value of the digit 3 in 9.431
Answer:
Step-by-step explanation:
One number would be
9.31
The 3 in this number is 3/10
The 3 in the given number is 3/100
3/10 is 10 times bigger than 3/100
3/10 = 0.3
3/100 = 0.03
0.03 * x = 0.3 Divide both sides by 0.03
0.03/0.03 x = 0.3/0.03
x = 10
If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the? wind, find the speed of the wind and the speed of the plane in still air.
Answer:
plane velocity (with wind) = 500 mph
plane velocity (against wind) = 420 mph
velocity difference divided by 2 = 40
plane velocity = 500 - 40 = 460 mph
Step-by-step explanation:
I don't know what 13.4, 6.5, 13.3, and 6.05 is in order from least to gratest
The Precision Scientific Instrument Company manufactures thermometers that are supposed to give readings of 0degreesC at the freezing point of water. Tests on a large sample of these thermometers reveal that at the freezing point of water, some give readings below 0degreesC (denoted by negative numbers) and some give readings above 0degreesC (denoted by positive numbers). Assume that the mean reading is 0degreesC and the standard deviation of the readings is 1.00degreesC. Also assume that the frequency distribution of errors closely resembles the normal distribution. A thermometer is randomly selected and tested. A quality control analyst wants to examine thermometers that give readings in the bottom 4%. Find the temperature reading that separates the bottom 4% from the others. Round to two decimal places. Find P40, the 40th percentile.
a)-0.57 degrees B) 0.57degrees C) 0.25 degrees D) -0.25 degrees
Find Q3, the third quartile.
a) 0.67 degrees B) 0.82 degrees C) -1.3 degrees D) 0.53 degrees
Answer:
The value that separates the bottom 4% is -1.75; the 40th percentile is D. -0.25 degrees; Q3 is A. 0.67 degrees.
Step-by-step explanation:
The bottom 4% has a probability of 4% = 4/100 = 0.04. Using a z-table, we find the value closest to 0.04 in the cells of the chart; this is 0.0401. This corresponds to a z value of -1.75.
The formula for a z score is
[tex]z=\frac{X-\mu}{\sigma}[/tex]
Substituting our values for z, the mean and the standard deviation, we have
-1.75 = (X-0)/1
X-0 = X, and X/1 = X; this gives us
-1.75 = X.
The 40th percentile is the value that is greater than 40% of the other data values. This means it has a probability of 0.40. Using a z-table, we find the value closest to 0.40 in the cells of the chart; this is 0.4013. This corresponds to a z value of -0.25.
Substituting this into our formula for a z score along with our values for the mean and the standard deviation,
-0.25 = (X-0)/1
X-0 = X, and X/1 = X; this gives us
-0.25 = X.
Q3 is the same as the 75th percentile. This means it has a probability of 0.75. Using a z-table, we find the value closest to 0.75 in the cells of the chart; this is 0.7486. This corresponds to a z value of 0.67.
Substituting this into our z score formula along with our values for the mean and the standard deviation,
0.67 = (X-0)/1
X-0 = X and X/1 = X; this gives us
0.67 = X.
Using the normal distribution, it is found that:
The temperature reading that separates the bottom 4% from the others is -1.75 ºC.The 40th percentile is of -0.25 ºC, option D.The third quartile is of 0.67 ºC, option A.In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
It measures how many standard deviations the measure is from the mean. After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.In this problem:
Mean of 0ºC, thus [tex]\mu = 0[/tex].Standard deviation of 1ºC, thus [tex]\sigma = 1[/tex].The temperature reading that separates the bottom 4% from the others is the 4th percentile, which is X when Z has a p-value of 0.04, so X when Z = -1.75.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]-1.75 = \frac{X - 0}{1}[/tex]
[tex]X = -1.75[/tex]
The temperature reading that separates the bottom 4% from the others is -1.75 ºC.
The 40th percentile is X when Z has a p-value of 0.4, so X when Z = -0.25.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]-0.25 = \frac{X - 0}{1}[/tex]
[tex]X = -0.25[/tex]
The 40th percentile is of -0.25 ºC, option D.
The third quartile is the 75th percentile, as [tex]\frac{3}{4}100 = 75[/tex], which is X when Z has a p-value of 0.75, so X when Z = 0.67.
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]0.67 = \frac{X - 0}{1}[/tex]
[tex]X = 0.67[/tex]
The third quartile is of 0.67 ºC, option A.
A similar problem is given at https://brainly.com/question/12403139
An isosceles triangle has two sides of equal length. The third side is 30 m shorter than twice the length of each congruent side. The perimeter is 570 m. Find the length of each side.
Answer:
150, 150, 270
Step-by-step explanation:
let the congruent sides be x, then
the third side is 2x - 30 ( 30 shorter than twice the congruent sides )
The perimeter = 570, hence
x + x + 2x - 30 = 570
4x - 30 = 570 ( add 30 to both sides )
4x = 600 ( divide both sides by 4 )
x = 150
2x - 30 = (2 × 150) - 30 = 300 - 30 = 270
The length of the 3 sides are 150, 150 and 270
need quick help with math!!!
[tex] \frac{5 - \sqrt{2} }{ \sqrt{3} } \\ \\ = \frac{5 - \sqrt{2} }{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } \\ \\ = \frac{(5 - \sqrt{2} ) \sqrt{3} }{( { \sqrt{3} )}^{2} } \\ \\ = \frac{5 \sqrt{3} - \sqrt{6} }{3} [/tex]
If r(x) = 2 – x2 and w(x) = x – 2, what is the range of (wor)(x) ?
The term (wor)(x) is unclear and needs clarification to accurately find the range. If it refers to the composition of the two functions (w◦r)(x) or (r◦w)(x), different ranges can be obtained.
Explanation:To find the range of (w or r)(x), we first need to evaluate this expression. Our given functions are r(x) = 2 - x² and w(x) = x - 2.
However, the function (wor)(x) is not clearly defined in this case since the term "or" does not have a traditional mathematical operation associated with it in this context. This question may well be referring to the composition of the two functions (w◦r)(x) or (r◦w)(x), but without clear instruction, a definitive answer cannot be given.
If it refers to (w◦r)(x), this means w(r(x)) which equals w(2-x²) = (2 - x²) - 2 = -x².
If it refers to (r◦w)(x), this means r(w(x)) = r(x-2) = 2 - (x - 2)².
Each of these composited functions would have a different range. Please clarify the meaning of (wor)(x) so a definitive answer can be provided.
Learn more about Function composition here:https://brainly.com/question/37026003
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