Question: The time necessary to complete A certain assembly-line task varies according to many factors: fatigue or freshness, worker skill, whether the required parts are available

The time necessary to complete A certain assembly-line task varies according to many factors: fatigue or freshness, worker skill, whether the required parts are available promptly, and so forth. Suppose that this variation may be adequately modeled using a normal distribution with mean 15 minutes and standard deviation 2 minutes. The quickest 15% of the assembly times are to be rewarded. How fast must an assembly be performed in order to be rewarded?

A. 11.71

B. 1.50

C. 10.34

D. 12.44

E. 12.92

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