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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.9 years, and standard deviation of 3.7 years.

The 3% of items with the shortest lifespan will last less than how many years?
4 years ago

Answers

PsyDAG
Find Z score for 3% in back of stat book.

Z = (?-13.9)/3.7
4 years ago

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