Mathematics, 25.02.2020 17:22, hopkinbr

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 the lifetimes between 3.0 and 3.4 hours.

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A consumer advocacy group tested the On air lifetimes A random sample of 241 cell phone batteries. T...

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