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Suppose that the life span of a company's oil-drilling bits is normally distributed with a mean of 75 hours and a standard deviation of 12
Suppose that the life span of a company's oil-drilling bits is normally distributed with a mean of 75 hours and a standard deviation of 12 hours.
a) What percentage of the company's drill bits will fail before 60 hours of use?
b) What percentage of the company's drill bits lasts between 70 and 80 hours?
c) At least how many hours will the longest 4% of the company's drill bits last?
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