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The mean lifetime was 32 hours with a standard deviation of

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.

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Basic Statistics: The mean lifetime was 32 hours with a standard deviation of

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Basic Statistics: The mean lifetime was 32 hours with a standard deviation of

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