Question: The amount of time that a certain phone will keep a charge is known to be normally distributed with standard deviation = 16 hours.

The amount of time that a certain phone will keep a charge is known to be normally distributed with standard deviation σ =

16 hours. A sample of 40 phones had a mean time of 141 hours. Let μ

represent the population mean time that a phone will keep a charge.

a. What is the point estimate of μ?

b. What is the standard error of the point estimate?

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