Mathematics College

Write a research problem that would be best studied using a probability sample.

Answers

Answer 1
A research problem could be of any topic. For example, you could make a research study based on the social status of people in the capital region. This would make a correlation with the country's economic performance. So, you gather around 1,000 respondents and you ask them some social class-determining questions. From your finding, you find that 823 of them belong to the lower class. Thus, the probability that a person in the capital region belongs to the lower class is equal to 823/1000 or 0.823.

Related Questions

Between 2005 and 2008, the average rate of inflation was about3.4 per year. If a cart of groceries cost $140 in 2005, what did it cost in 2008

Answers

The formula is
A=p (1+r)^t
A future value?
P current value 140
R rate of inflation 0.034
T time 2008-2005=3 years
A=140×(1+0.034)^(3)
A=154.77 round your answer to get
A=155

The equation d=13/v shows that the density of a particular substance equals a mass of 13 grams divided by the volume of the substance. What happens to the density as the volume approaches 0?

Answers

d = M/V where M=mass and V = volume

Assume the Mass is 1 kg and the Volume = 1 cm³, so d= 1/1 kg/cm³

for V=0.1 → d = 1/0.1 = 10 kg.cm³
for V = 0.01 → d = 100.kg.cm³
for V = 0.001 → d = 1000.kg.cm³
for V = 0.000001 → d = 1,000,000.kg.cm³
and when Volume → 0. density →∞
.

Answer: the density approaches infinity

Step-by-step explanation:

WILL GIVE BRAINLIEST...
You have 45 ft of the fence you enclose your yard, you are going to use the side of your house as one of the sides and put a fence down the width of the yard so your dog as a place to play, the length is three less than the width. What is the area of your yard?

Answers

We have 45 ft of the fence and we are going to use the side of the house as one of the sides ( on length ).
L = W - 3
2 W + L = 45
2 W + W - 3 = 45
3 W = 45 + 3
3 W = 48
W = 48 : 3
W = 16 ft
L = 16 - 3 = 13 ft
A = 16 * 13 = 208 ft²
Answer: The area of the yard is 208 ft².

How do you convert 6 feet into meters?

Answers

1.8288 is the corect answer. There are unit converters online.

6 feet is equal to 1.829 m exactly.

Two trains leave a train station traveling different directions. The first train travels 12 miles west, then 6 miles north. The second train travels 20 miles east, then 35 miles north.
a. The train station is the origin. What is the coordinate of each train?
b. Using the city center and the stop point of the first train, what is the slope of the line? Is it horizontal, vertical or neither? Write the equation of the line in slope-intercept form and standard form.
c. The city wants to build a train station 2 miles directly north of the first train station. They are going to build a train track parallel to the path the first train would’ve traveled if it were a direct route from the city center. What would be the equation of the line in slope intercept form of the new track?

Answers

Draw a diagram to illustrate the problem as shown below.
The origin (0, 0) is the train station.

Part a.
The first train travels 12 miles west and 6 miles north to arrive at A.
It's coordinate is (-12, 6).

The second train travels 20 miles east and 35 miles north to arrive at B.
It's coordinate is (20, 35).

Part b.
The slope of the line from the origin to A is
m = (6 - 0)/(-12 - 0) = -1/2.
The slope is neither vertical nor horizontal.
The y-intercept is 0.

The line OA is given in slope-intercept form by
y = -(1/2)x
In standard form, the line is
y - 6 = -(1/2)*(x - (-12))
or
y - 6 = -(1/2)*(x + 12)

Part c.
The new train station is located at (0, 2) because it is 2 miles north of the old station.
If a new track is built parallel to OA, then it should have a slope of -1/2.
Because it's y-intercept is 2, its equation in slope-intercept form is
y = -(1/2)x + 2.

Answer:a. first (-12,6) second (20,35)

b. y = -1/2x, 2y + 1x = 0 (neither horizontal or vertical)

c. y= -1/2x + 2.

Step-by-step explanation:

What is the answer, with the correct number of decimal places, for this problem? 4.392 g + 102.40 g + 2.51 g =?

Answers

The summation of 4.392 g + 102.40 g + 2.51 g with three decimal places is 109.302 g.

What is summation?

A summation, also abbreviated as a sum, is the outcome of adding two or more numbers or quantities. Here are always an integer number of terms in a summation. There could be only two terms, but there could be one hundred, thousand, or a million.

Given the expression for sum,

4.392 g + 102.40 g + 2.51 g

⇒ (4.392 + 102.40 + 2.51)g

⇒ 109.302 g

Hence "The summation of 4.392 g + 102.40 g + 2.51 g with three decimal places is 109.302 g".

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Final answer:

The sum of the masses 4.392 g, 102.40 g, and 2.51 g is 109.30 g.

Explanation:

A summation, which can sometimes be shortened to "sum," is the result of multiplying two or more quantities by one another. A summation always has an integer number of terms. One hundred, thousand, or a million phrases could exist, but there could only be two.

The sum of the masses 4.392 g, 102.40 g, and 2.51 g is 109.302 g.

To ensure the correct number of decimal places, we need to consider the measurement with the least number of decimal places, which is 2.51 g.

Since 2.51 g has two decimal places, we round the sum to two decimal places as well.

Therefore, the answer is 109.30 g.

i need to know the solution using a fraction or integer to 3 more than the product of 7 and a number x is less than 26

Answers

so.. the number is "x", now, the product of "x" and 7 is just 7*x or 7x.

3 more than that? is just 7x + 3

so, we know is less than 26, 7x + 3 < 26

[tex]\bf 7x+3\ \textless \ 26\implies 7x\ \textless \ 26-3\implies 7x\ \textless \ 23\implies x\ \textless \ \cfrac{23}{7} \\\\\\ \boxed{x\ \textless \ 3\frac{2}{7}}\qquad \qquad 3\frac{2}{7}\implies \cfrac{3\cdot 7+2}{7}\implies \cfrac{23}{7}[/tex]

3 1/6 divided by 5/8

Answers

The result of 3 1/6 divided by 5/8 is equal to 76/15.

To divide a mixed number by a fraction, we need to convert the mixed number into an improper fraction.

In this case, 3 1/6 can be written as an improper fraction as (3 × 6 + 1) / 6 = 19/6.

Next, we can multiply the numerator of the fraction by the reciprocal of the divisor.

The reciprocal of 5/8 is 8/5.

So, (19/6) ÷ (5/8) = (19/6) × (8/5) = (19 × 8) / (6 × 5) = 152/30.

The fraction 152/30 can be simplified by dividing both the numerator and denominator by their greatest common divisor, which in this case is 2. So, (152/30) ÷ 2 = 76/15.

Therefore, 3 1/6 divided by 5/8 is equal to 76/15.

Final answer:

To find the result of 3 1/6 divided by 5/8, convert the mixed number to an improper fraction, multiply by the reciprocal of the divisor, and simplify the resulting fraction. The answer is 5 1/15.

Explanation:

The student's question 3 1/6 divided by 5/8 is a mathematics problem that involves division of mixed numbers and fractions. To solve this problem, the student first needs to convert the mixed number into an improper fraction. To do this, the student multiplies the whole number by the denominator of the fractional part and then adds the numerator:

Multiply 3 (the whole number) by 6 (the denominator of the fractional part): 3 x 6 = 18.

Add the numerator (the fractional part's numerator, which is 1): 18 + 1 = 19. So, 3 1/6 becomes 19/6.

The next step is to divide 19/6 by 5/8. In division of fractions, you multiply by the reciprocal of the divisor. The reciprocal of 5/8 is 8/5.

Therefore, you multiply 19/6 by 8/5: 19/6 x 8/5.

Perform the multiplication of numerators and denominators: 19 x 8 = 152 and 6 x 5 = 30.

The result is 152/30. This fraction can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 2.

The simplified answer is 76/15, or as a mixed number, 5 1/15.

This shows that 3 1/6 divided by 5/8 is 5 1/15.

8meters long 4 meters wide and 2 meters deep.What is the volume of the pond.

Answers

Volume of a 3 dimensional object is Length x Width x Height. The length is 8 meters, the width is 4 meters, and the height (the depth rather) is 2 meters. Therefore, the volume of the pond is equal to 8 x 4 x 2

8 x 4=32 x 2=64

The volume of the pond is 64 meters

Find the surface area of x^2+y^2+z^2=9 that lies above the cone z= sqrt(x^@+y^2)

Answers

The cone equation gives

[tex]z=\sqrt{x^2+y^2}\implies z^2=x^2+y^2[/tex]

which means that the intersection of the cone and sphere occurs at

[tex]x^2+y^2+(x^2+y^2)=9\implies x^2+y^2=\dfrac92[/tex]

i.e. along the vertical cylinder of radius [tex]\dfrac3{\sqrt2}[/tex] when [tex]z=\dfrac3{\sqrt2}[/tex].

We can parameterize the spherical cap in spherical coordinates by

[tex]\mathbf r(\theta,\varphi)=\langle3\cos\theta\sin\varphi,3\sin\theta\sin\varphi,3\cos\varphi\right\rangle[/tex]

where [tex]0\le\theta\le2\pi[/tex] and [tex]0\le\varphi\le\dfrac\pi4[/tex], which follows from the fact that the radius of the sphere is 3 and the height at which the sphere and cone intersect is [tex]\dfrac3{\sqrt2}[/tex]. So the angle between the vertical line through the origin and any line through the origin normal to the sphere along the cone's surface is

[tex]\varphi=\cos^{-1}\left(\dfrac{\frac3{\sqrt2}}3\right)=\cos^{-1}\left(\dfrac1{\sqrt2}\right)=\dfrac\pi4[/tex]

Now the surface area of the cap is given by the surface integral,

[tex]\displaystyle\iint_{\text{cap}}\mathrm dS=\int_{\theta=0}^{\theta=2\pi}\int_{\varphi=0}^{\varphi=\pi/4}\|\mathbf r_u\times\mathbf r_v\|\,\mathrm dv\,\mathrm du[/tex]
[tex]=\displaystyle\int_{u=0}^{u=2\pi}\int_{\varphi=0}^{\varphi=\pi/4}9\sin v\,\mathrm dv\,\mathrm du[/tex]
[tex]=-18\pi\cos v\bigg|_{v=0}^{v=\pi/4}[/tex]
[tex]=18\pi\left(1-\dfrac1{\sqrt2}\right)[/tex]
[tex]=9(2-\sqrt2)\pi[/tex]

Which of the following is closest to 27.8 times 9.6? A. 280. B 300. C 2,800. D 3,000

Answers

A 280. you really couldn't use a calculator?
The answer would be A because multiplying the 2 numbers give you 266.88

One card is selected at random from an ordinary deck of 52 playing cards. let a = event a face card is selected

Answers

we have three face card and 4 groups of cards
3*4=12
12/52=3/13
p(a)=3/13

Anoav uses which statistical distribution to determine the significance of the results

Answers

In statistics, ANOVA means Analysis of Variance. This is a statistical tool that helps in determining if the effect of the independent variable on the dependent variable is significant or not. It uses the F-distribution to determine the difference of means. That is why the other name for ANOVA is the F-test. It was named in honor of Ronald Fisher. It is a table consisting of F values which is simply the ratio of two variances. It depends on the degrees of freedom and the α to be used. A sample of the F-table is shown in the picture.

A new basketball costs $25.00 at the sporting goods store. If the store is having a going-out-of-business sale and everything is 60% off, what is the actual cost of the basketball?

Answers

Final answer:

To calculate the discounted price of the basketball, multiply the original price ($25.00) by 60% to find the discount ($15.00), and subtract this from the original price to get the final price ($10.00).

Explanation:

To find out the actual cost of the basketball after a 60% discount, we start by calculating the amount of the discount. A 60% discount on a $25.00 basketball means the discount is 60/100 times $25.00. To do the calculation:

First, we convert the percentage to a decimal: 60% = 0.60.Then, we multiply the original price by the decimal: $25.00 × 0.60 = $15.00.This $15.00 is the amount of the discount.

To find the discounted price, we subtract the discount from the original price: $25.00 - $15.00 = $10.00. Therefore, the discounted price of the basketball is $10.00.

Find The Perimeter Of The Shaded Region

90 ft
58 ft
24 ft
38 ft

Answers

l  = 14 - 6 = 8
w = 15 - 4 = 11

P of shaded = 2(8+9) = 2 (19) = 38

answer
last one 38ft

Answer:

38 ft

Step-by-step explanation:

Perimeter of the rectangle = 2* length + 2* width

Length of shaded part = Length of the larger rectangle - 4 = 11ft

width of the shaded part = width of the larger rectangle - 6 = 8 ft

Perimeter of the rectangle = 2* length + 2* width

Plug in the values of length and width

Perimeter of the shaded rectangle= 2(11) + 2(8)=  22+ 16= 38   feet

Milla and Luka are 3 kilometers apart and walking toward each other. Milla's average speed is 5 kilometers per hour and Luka's is 4 kilometers per hour.

Which equation can be used to find t, the time it takes for Milla and Luka to meet?
5t + 4t = 1
5t + 4t = 3
5t – 4t = 0
5t – 4t = 3

Answers

Answer: Second option is correct.

Step-by-step explanation:

Since we have given that

Speed of Milla = 5 km per hour

Speed of Luka = 4 km per hour

Distance between Milla and Luka = 3 km

Let the time be 't'.

As we know that

[tex]Distance=Speed\times time[/tex]

So, it becomes,

Distance covered by Milla + Distance covered by Luka = Total distance

[tex]5t+4t=3[/tex]

Hence, Second option is correct.

If $3500 is invested at the rate of 8%, compounded quarterly, what will be the value of the investment 17 years from now, assuming no withdrawals?

Answers

We will use the compound interest formula, which is

A = P(1+r/n)^(n*t)

The variables are

A = amount in the account after t years
P = initial amount invested
r = interest rate (in decimal form)
n = compounding frequency
t = number of years

In this case

A = unknown (we're solving for this)
P = 3500
r = 0.08 (8% = 8/100 = 0.08)
n = 4 (compound quarterly ---> compound 4 times a year)
t = 17

------------------------------------------

Plug all these values into the equation to get...

A = P(1+r/n)^(n*t)
A = 3500(1+0.08/4)^(4*17)
A = 3500(1+0.02)^(4*17)
A = 3500(1.02)^(4*17)
A = 3500(1.02)^(68)
A = 3500(3.8442505025456)
A = 13454.8767589096
A = 13454.88

This means that you will have $13454.88 in the account after 17 years

Final Answer: 13454.88

What is 18a and 12ab's GCF

Answers

Answer:

  6a

Step-by-step explanation:

18a = 2 · 3² · a

12ab = 2² · 3 · a · b

Factors common to both lists are 2, 3, a, so the GCF is 2·3·a = 6a.

Suppose a​ least-squares regression line is given by modifyingabove y with caret equals 4.302 x minus 3.293y=4.302x−3.293. what is the mean value of the response variable if x equals 20x=20

Answers

Final answer:

The mean value of the response variable y when x equals 20 in the least-squares regression line equation y = 4.302x - 3.293 is 82.041.

Explanation:

The given equation is y = 4.302x - 3.293, which is a least-squares regression line. In this formula, x is the independent variable and y is the resulting dependent variable or response. The goal is to find the mean value of the response variable when x is 20. This can be achieved simply by plugging 20 in place of x in our equation and calculating the resulting value for y.

We will substitute x = 20 into the equation y = 4.302x - 3.293. Therefore, the value of y when x is 20 is:

y = 4.302(20) - 3.293 = 82.041

So, when x = 20, the mean value of the response variable y or the predicted y value is 82.041.

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Find a nonzero vector normal to the plane

Answers

Find a nonzero vector normal to the plane z - 3 (x - 1) = -3 (4 - y).

ok so what is is the square root of 1234 i dot know

Answers

sqrt(1234) = 35.1283

 you don't say how it should be rounded, so round off as needed

Find the volume: in cm 7cm high 3cm wide 2 cm long

Answers

v=l×w×h
so 7×3×2=42 cm3
The answer is 42 cm cubed


From the 11

male and 6

female sales representatives for an insurance​ company, a team of 3

men and 2

women will be selected to attend a national conference on insurance fraud.
In how many ways can the team of 5

be​ selected?

Answers

Selecting r objects out of n objects, can be done in C(n, r) many ways.

For example selecting groups of 4 people out of 10 people can be done in
C(10, 4) many ways.


C(n, r) is calculated as follows: [tex]C(n, r)= \frac{n!}{r!(n-r!)} [/tex], 

where n! is 1*2*3*...*(n-1)*n


3 men out of 11 men, and 2 women out of 6 women are to be selected.

This can be done in C(11, 3) and C(6,2) ways respectively.

Since any of the selected men group can be combined with any of the selected women group, there are C(11, 3)*C(6,2) many ways of selecting the team of 5.


[tex]C(11, 3)*C(6,2) = \frac{11!}{8!3!} * \frac{6!}{4!2!}= \frac{11*10*9*8!}{8!*3!}* \frac{6*5*4!}{4!*2!}= \frac{11*10*9}{3*2*1} * \frac{6*5}{2*1}= [/tex]

165*15=2475


Answer: 2475

The casino la bella fortuna is for sale and you think you might want to buy it, but you wantto know how much money you are going to make. all the present owner can tell you is thatthe roulette game red or black is played about 1000 times a night, 365 days a year. eachtime it is played you have probability 19/37 of winning the player’s bet of $10 and probability18/37 of having to pay the player $10.

Answers

Expected gain per player per game 
10*(19/37)-10*(18/37)=0.27027
Expected gain per player per night (1000 games per night)
=1000*0.27027
=270.27
Expected gain per player per year  (365 nights per year)
=270.27*365
=98648.65

Revenue is 98648.65 times the average number of players per game.

Final answer:

The expected value of the roulette game red or black is -$0.62 per game, indicating an expected average loss.

Explanation:

The expected value of the roulette game red or black can be calculated by multiplying the probabilities of winning and losing by their corresponding outcomes. In this case, the probability of winning ($10) is 19/37, and the probability of losing ($-10) is 18/37. Multiply these probabilities by their corresponding outcomes and subtract to get the expected value:

Expected value = (19/37 * $10) + (18/37 * -$10) = -$0.54 + (-$0.54) = -$0.62

This means that if you play this game repeatedly, over a long string of games, you would expect to lose an average of 62 cents per game.

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(03.03 HC)

The table shows the outputs, y, for different inputs, x:

Input (x) 6 12 15 25
Output (y) 14 15 15 16



Part A: Do the data in this table represent a function? Justify your answer. (3 points)

Part B: Compare the data in the table with the relation f(x) = 7x − 15. Which relation has a greater value when x = 6? (2 points)

Part C: Using the relation in Part B, what is the value of x if f(x) = 6? (5 points)

Answers

part A the table does not show function because 15 is repeated which is a relationship.

How do you interpret algebraic expressions in terms of their context

Answers

Algebraic expressions are composed of numbers and variables. To interpret them, you must have the word problem to provide you with some context. The variables signify parameters that are maybe unknown in the problem. Although unknown, they can have relationships with each other. The relationships are expressed in algebraic equations.

a garden table and a bench cost 817 dollars combined. The garden table costs 83 less than the bench. what is the cost of the bench

Answers

table=t
bench=b


t=b-83

t+b=817
b-83+b=817
2b=900
b=450 ($)



"Non nobis, Domine, non nobis, sed Nomini tuo da gloriam."



Regards M.Y.

Consider the following.
Point
(-5, 4)
 Line   
x + y = 7
(a) Write the slope-intercept form of the equation of the line through the given point and parallel to the given line.

(b) Write the slope-intercept form of the equation of the line through the given point and perpendicular to the given line.

Answers

x + y = 7....y = -x + 7....the slope here is -1

A. a parallel line will have the same slope
    y = mx + b
    slope(m) = -1
    (-5,4)...x = -5 and y = 4
    sub and find b, the y int
    4 = -1(-5) + b
    4 = 5 + b
    4 - 5 = b
    -1 = b
so ur parallel line is : y = -x - 1 <==

B. perpendicular lines have negative reciprocal slopes. That means our perpendicular line will have a slope of 1
   y = mx + b
   slope(m) = 1
   (-5,4)...x = -5 and y = 4
   now we sub and find b, the y int
   4 = 1(-5) + b
   4 = -5 + b
   4 + 5 = b
   9 = b
so ur perpendicular line is : y = x + 9 <==

What is the reciprocal of 2 2/3

Answers

[tex]\bf 2\frac{2}{3}\implies \cfrac{2\cdot 3+2}{3}\implies \cfrac{8}{3}\qquad reciprocal\implies \cfrac{3}{8}[/tex]
3/8, because you make the mixed number an improper fraction(8/3), then you flip it (3/8)

negative 2 to the 3 power

Answers

-2^3 = -2 * -2 * -2 = -8
2 to the power of 3 is 8
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