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A Life test on a large number of type D alkaline batteries revealed that the mean life for a particular use before failure is 19.0

A Life test on a large number of type D alkaline batteries revealed that the mean life for a particular use before failure is 19.0 hours and the standard deviation of the distribution was 1.2 hours.

Determine the area between 17.8 hours and 20.2 hours.
Determine the area to the right of16 hours

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