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Mathematics, 11.03.2020 02:40 nickocasamplonp6mlob

A consumer advocacy group tested the "on-air" lifetimes a random sample of 241 cell phone batteries. The mean lifetime was 3.2 hours with a standard deviation of 0.1 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 3.0 hours and 3.4 hours. A) 164. B) 12.C) 229.D) Almost all (greater than 229).

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