Ask question

Ask question

All categories

3 years ago

5

You bought a lawn mower for $80. For every lawn you cut, you plan to charge customers $20. Which graph shows how many lawns you

must cut to earn back the money spent on the lawn mower?

2 answers:

Ivanshal [37]3 years ago

6 0

Answer: you must cut 4 lawns to earn the money back .

Step-by-step explanation:

one lawn=$20

two lawns=$40

three =$60

four=$80

erica [24]3 years ago

6 0

Top Right Graph on TTM

You might be interested in

In a recent year, Washington State public school students taking a mathematics assessment test had a mean score of 276.1 and a s

Oksi-84 [34.3K]

Answer:

a) $\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

b) From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

c) $P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

$P(Z\geq2.070)=1-P(Z$

Step-by-step explanation:

Let X the random variable the represent the scores for the test analyzed. We know that:

$\mu=E(X) = 276.1 , \sigma=Sd(X) = 34.4$

And we select a sample size of 64.

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Part a

For this case the mean and standard error for the sample mean would be given by:

$\mu_{\bar x} =\mu = 276.1$

$\sigma_{\bar x} =\frac{\sigma}{\sqrt{n}}=\frac{34.4}{\sqrt{64}}=4.3$

Part b

From the central limit theorem we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu=276.1, \frac{\sigma}{\sqrt{n}}=4.3)$

Part c

For this case we want this probability:

$P(\bar X \geq 285)$

And we can use the z score defined as:

$z=\frac{\bar x -\mu}{\sigma_{\bar x}}$

And using this we got:

$P(\bar X \geq 285)=P(Z\geq \frac{285-276.1}{4.3}=2.070)$

And using a calculator, excel or the normal standard table we have that:

$P(Z\geq2.070)=1-P(Z$

8 0

3 years ago

How do you do the equation 3.25 divided by 5.2

valentina_108 [34]

$3.25\ divided\ by\ 5.2= \frac{3.25}{5.2} =\frac{3.25\cdot 20}{5.2\cdot20} =\frac{65}{104} =\frac{65:13}{104:13} = \frac{5}{8} =0.625\\\\Ans.\ 0.625$

5 0

4 years ago

25 Points! Midterm Today! Can anyone help with this problem?

Andrews [41]

I really do wish I could help But I’m not sure I tried to figure it out and i just can’t get it

6 0

4 years ago

Plz help me some plz, i posted this question 1000 times plz some one answer, thank you so much plzz show all the working i reall

Dima020 [189]

Answer:

sorry man I really don't know hopefully you can find an answer

3 0

3 years ago

What is the value of x?

maw [93]

X+(4x-20)=180
=>5x-20=180
=>5x=200
=>x=40

8 0

3 years ago