melissa started a dog walking business.melissa earns $ 16 for every 2 hours she walks dogs complete the table and graph the ordered pairs

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keepcalmands2930

04.08.2020

Mathematics

$z= \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And replacing we got:

$z=\frac{4.3 -4.4}{\frac{1}{\sqrt{625}}}= -2.5$

And the best option would be:

d) -2.5

Step-by-step explanation:

For this problem we know that the true mean of trash every day is:

$\mu =4.4$

And from the info given we also know that:

$\bar X=4.3$ represent the sample mean

n=625 sample size selected

$\sigma = 1$ the population standard deviation assumed

If we want to find the z score for the person we can use the following formula:

$z= \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And replacing we got:

$z=\frac{4.3 -4.4}{\frac{1}{\sqrt{625}}}= -2.5$

And the best option would be:

d) -2.5

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