3. What is the value ofy?
A. 3
C. 6
B. 8
D. 12

Answer:

20 lawns

Step-by-step explanation:

$1000 divided by $50 = 20

Answer:

B

Step-by-step explanation:

[tex]15%of$13,450=$2,017.50[/tex]%[tex]of13,450=2,017.50[/tex] therefore the down payment is $2,017.50

Answer:

a) 16.6

b) The 95% confidence level of the mean of the time playing video games is between 15.7 and 17.5 hours.

c) The 99% confidence level of the mean of the time playing video games is between 15.4 and 17.8 hours.

d) The margin of error increases as the confidence level increases, due to the value of z, which means that the 99% confidence interval is larger.

Step-by-step explanation:

a. Find the best point of estimate of the population mean

The best estimate for the population mean is the sample mean, which is 16.6

b. Find the 95% confidence level of the mean of the time playing video games

We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:

[tex]\alpha = \frac{1 - 0.95}{2} = 0.025[/tex]

Now, we have to find z in the Ztable as such z has a pvalue of [tex]1 - \alpha[/tex].

That is z with a pvalue of [tex]1 - 0.025 = 0.975[/tex], so Z = 1.96.

Now, find the margin of error M as such

[tex]M = z\frac{\sigma}{\sqrt{n}}[/tex]

In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.

[tex]M = 1.96\frac{2.8}{\sqrt{35}} = 0.9[/tex]

The lower end of the interval is the sample mean subtracted by M. So it is 16.6 - 0.9 = 15.7 hours

The upper end of the interval is the sample mean added to M. So it is 16.6 - 0.9 = 17.5 hours

The 95% confidence level of the mean of the time playing video games is between 15.7 and 17.5 hours.

c. Find the 99% confidence interval of the mean time playing video games

Following the same logic as above, we have that [tex]Z = 2.575[/tex]. So

[tex]M = 2.575\frac{2.8}{\sqrt{35}} = 0.9[/tex]

The lower end of the interval is the sample mean subtracted by M. So it is 16.6 - 1.2 = 15.4 hours.

The upper end of the interval is the sample mean added to M. So it is 16.6 + 1.2 = 17.8 hours.

The 99% confidence level of the mean of the time playing video games is between 15.4 and 17.8 hours.

d. Which is larger? Explain why.

The margin of error increases as the confidence level increases, due to the value of z, which means that the 99% confidence interval is larger.

The mean is 16.6, 95% confidence interval is between 15.68 to 17.52, the 99% confidence interval is between 15.39 to 17.81, and the 99% confidence interval is larger.

It is given that the in recent study of 35 ninth-grade students the mean number of hours per week is 16.6 with standard deviation of the population was 2.8.

It is required to find the best point of estimate of the population mean, 95% confidence interval, and 99% confidence interval.

It is defined as the sampling distribution following an approximately normal distribution for known standard deviation.

We have confidence level = 95% = 0.95

We know:

[tex]\alpha = \frac{1-0.95}{2}[/tex]  = 0.025

[tex]\rm Z_1 _-_\alpha = Z_{0.975} = 1.96[/tex]  (from the Z table)

The sample size n = 35

We know the Margin of error formula:

[tex]\rm M =Z\frac{\sigma}{\sqrt[]{n} }[/tex]  ( [tex]\rm \sigma\\[/tex] = 2.8 )

[tex]\rm M =1.96\frac{2.8}{\sqrt[]{35} }[/tex]  

M = 0.92

The 95% interval will be:

= X - M ⇒ 16.6 - 0.92 ⇒15.68

= X+ M ⇒ 16.6+0.92 ⇒ 17.52

For 99% confidence level:

[tex]\alpha = \frac{1-0.90}{2} = 0.005[/tex]

[tex]\rm Z_1 _-_\alpha = Z_{0.005} = 2.575[/tex]  (from Z table)

[tex]\rm M =2.575\frac{2.8}{\sqrt[]{35} }[/tex]

M = 1.21

The 99% interval will be:

=16.6 - 1.21 ⇒  15.39

= 16.6+ 1.21 = 17.81

As the value of M increases the confidence value increases due to the value of Z that means 99% confidence interval is larger.

Thus, the mean is 16.6, 95% confidence interval is between 15.68 to 17.52, the 99% confidence interval is between 15.39 to 17.81, and the 99% confidence interval is larger.

Learn more about the confidence interval here:

brainly.com/question/6654139

Answer:

Graph.

The graph shows 6 texts an hour, but should show 12 texts an hour.

Answer:

no it cannot be

Step-by-step explanation:

because :

2/10 equals to 10/2 So 6/10 ÷ 2/10 =6/10×10/2

6×10=60

10×2=20 after reducing the fraction its 3/1

Answer:

3,10,17,24

Step-by-step explanation:

An Arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant.

3,10,17,24

the difference is 7

Answer: Base = 90 [tex]cm^{2}[/tex]

Step-by-step explanation:

Answer:

c. The sampling distribution of the sample means can be assumed to be approximately normal because the distribution of the sample data is not skewed

Step-by-step explanation:

From the given data, we have;

The category of the sample = Retired individuals

The number of participants in the sample = 20

The duration of program = six-weeks

The improvement seen by most participants = Little to no improvement

The improvement seen by few participants = Drastic improvement

Therefore, given that the participants are randomly selected and the majority of the participants make the same observation of improvement in the time to walk a mile, we have that, the majority of the outcomes show little difference in walk times after the program, therefore, the distribution of the sample data is not skewed and can be assumed to be approximately normal

Answer:

46 yd²

Step-by-step explanation:

Answer:

I think it's (0,3) sorry if it not

Answer:

(3, 0)

Step-by-step explanation:

The vertex point is 3 units to the right of the origin, making the x-coordinate 3, but it doesn’t move up or down, meaning that the y-coordinate is 0.

so it’s (3,0)

Btw, the vertex is the point of the parabola where it’s the minimum or maximu (minimum in this case). You answered for the y-interceptm which is where the parabola touches the y-axis.

Answer:

3. 25/28

4. 1 1/7

Step-by-step explanation:

when you divide fractions just flip one of them and then multiply across

so instead of 5/7 ÷ 4/5 its

5/7 • 5/4

please mark me brainliest to help me get ace rank

Answer:

1, 2, 4, 11, 22, 44.

Step-by-step explanation:

Hope this helps :)

Answer:

7 is greater than or equal to x.

Answer:

Hey I’m not sure but I think it’s A

Step-by-step explanation:

Answer:

Step-by-step explanation:

you have to add 8 in both sides

x-8<-1

x-8+8<-1+8

x<7

Answer:x<7

Step-by-step explanation:

Step 1: Add 8 to both sides.

x−8+8<−1+8

x<7

Answer:303.19

Step-by-step explanation: HOPE I HELPED

Answer:

[tex]p\approx 0.39[/tex]

Step-by-step explanation:

We are given a circle of radius 4 cm, and a triangle inscribed within the circle with a vertical height of 6.5 cm and a base of 6 cm.

To find the probability a randomly selected point lands in the red area, we can divide the red area by the total area.

The area for a circle is given by:

[tex]A=\pi r^2[/tex]

Since the radius is 4 cm, the area of the circle or total area is:

[tex]A=\pi (4)^2=16\pi \text{ cm}^2[/tex]

The area for a triangle is given by:

[tex]\displaystyle A=\frac{1}{2}bh[/tex]

The base of the triangle is 6 cm total and the vertical height is 6.5 cm. Therefore, the area is:

[tex]\displaystyle A=\frac{1}{2}(6)(6.5)=19.5\text{ cm}^2[/tex]

The probability of landing in the red shaded area is:

[tex]\displaystyle p=\frac{\text{Red Region}}{\text{Total Region}}[/tex]

Therefore:

[tex]\displaystyle p=\frac{19.5}{16\pi}\approx 0.39=39\%[/tex]

Step-by-step explanation:

d.

e +e+25=180°{sum of angle of triangle}

2e+25=180°

2e=155

e=155/2

e=77.5°

e.

55°+55°+f=180°{sum of angle of triangle}

f=180-110

f=70°

hope it helps.

Answer:

False

Step-by-step explanation:

Brainliest please?

Answer:

3

.75

the solved version would be .421875

the numbers on top are translated in English to .75 to the power of 3.

Step-by-step explanation:

I'm pretty sure this is correct

Answer:

-21x-19

Step-by-step explanation:

Answer:

The answer is -19 - 21n

by the way in the image those are the letter N, I hope this helps you :)

Answer:

30

Step-by-step explanation:

This is a bit nasty, but you must keep the order in mind. PQR means that Q is the middle letter. M is also the middle letter. That's the easy part. What does MNL mean?

The lettering goes clockwise. MNL is the same thing as QRP. So what is R?

50 + 100 + R = 180

150 + R = 180

R = 180 - 150

R = 30

Answer:

Combine like terms: 18x + 15x = 33x

(45 + 33x + 6x2)

Step-by-step explanation:

Answer:

Combine like terms: 18x + 15x = 33x

(45 + 33x + 6x2)

Step-by-step explanation:

Answer:

A. [tex]V = (pi)(3.25)^2(12)[/tex]

Step-by-step explanation:

The formula for the volume of a cylinder is the formula for the area of the circle, times the height of the cylinder. The formula for the volume of a circle is,

[tex]A = (pi)(r)^2[/tex]

Multiply that by the height to find the formula for the volume of a cylinder,

[tex]V=(pi)(r)^2(h)[/tex]

Where (pi) represents the value (3.1415), (r) represents the radius, and (h) represents the height of the cylinder. Now substitute in the given values, remember, this problem gives the diameter of the cylinder, divide that value by two to find the radius.

[tex]V=(pi)(\frac{6.5}{2})^2(12)\\\\V = (pi)(3.25)^2(12)[/tex]

Answer:

X = 120

Step-by-step explanation:

here's your solution

=> we need to find the number whose 25%

is 30

=>. now , let the number be X

=> solve for X

=>. 25/100*X = 30

=> X = 30*100/25

=> X = 120

hope it helps

Answer:

false

Step-by-step explanation:

Sofia is wrong; 1/3 · 1/3 · 1/3 · 1/3 = 11/12.