Mathematics, 18.05.2021 20:50 carlomorales200

A consumer advocacy group tested the "on-air" lifetimes of a random sample of 198 cell phone batteries. The mean lifetime was 3.8 hours with a standard deviation of 0.1 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 3.7 hours and 3.9 hours.

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