need help with question

Puryfrn12345678
timer Asked: Mar 5th, 2015

Question Description

The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken. the life span of the top .15 of the light bulbs is what?

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