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Statistics: accelerated life test on type-D alkaline batteries for failure values

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An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.2 hours. About 95.44 percent of the batteries failed between what two values?

8.9 and 18.9

12.2 and 14.2

14.1 and 22.1

16.6 and 21.4

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The correct answer is "16.6 and 21.4"

In a normal distribution, about 95% ...

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