He life expectancy of a brand of hair dryer is normally, Ask an Expert

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he life expectancy of a brand of hair dryer is normally distributed wiht a mean of four years and a standard deviation of 8 months.

a. What is the probability that the hair dryer willb e in working condition for more than 5 years?

b. What is the minimum and maximum life expectancy of the middle 90% of hte hair dryers?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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