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the length of time a particular smartphone's battery last follows an exponential distribution with a mean of 10 months. a sample of 64 of these

the length of time a particular smartphone's battery last follows an exponential distribution with a mean of 10 months. a sample of 64 of these smartphones is taken.

A. what is the standard deviation?

B. find the probability that the sample mean is between 7 and 11.

C. find the 80th percentile for the total length of time 64 batteries last

D. find the middle 80% for the total amount of time 64 batteries last

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