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Suppose the average cellphone bill is normally distribution with a mean of $115 a month and a standard deviation of $20 . If 16 cell

Suppose the average cellphone bill is normally distribution with a mean of $115 a month and a standard deviation of $20. If 16 cell phone bills are randomly sampled from the population, solve the following:

a. What isthe z-value for a $108 phone bill?

b. What is the z-value for a $125 phone bill?

c. What is the probability that the sample mean phone bill is between $108 and $125?

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