What is the distribution for the total length of batteries

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Question: 1. The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A sample of 64 of these smartphones is taken.

2. What is the distribution for the total length of time 64 batteries last?

3. Find the probability that the sample mean is between seven and 11.

Reference no: EM131643826

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