Determine the number of batteries with lifetimes 2.3

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Question:

A consumer advocacy group tested the "on-air" lifetimes a random sample of 212 cell phone batteries. The mean lifetime was 2.7 hours with a standard deviation of 0.4 hours. Determine the number of batteries with lifetimes between 2.3 hours and 3.1 hours.

Reference no: EM132400073

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