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A life test for a large number of D type alkaline batteries revealed that the average duration for a specific use before failure was 19

A life test for a large number of "D" type alkaline batteries revealed that the average duration for a specific use before failure was 19 hours. The distribution of the durations approximates a normal distribution with a standard deviation of 1.2 hours. 



What is the duration such that the duration of 10% of the batteries is greater than this?

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