SOLUTION: A manufacturer finds the life expectancy of a dishwasher to be 11 years. The standard deviation for the lifespan is 1 year. What percent of the washers will last from 9 to 13 years
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Question 259454: A manufacturer finds the life expectancy of a dishwasher to be 11 years. The standard deviation for the lifespan is 1 year. What percent of the washers will last from 9 to 13 years?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A manufacturer finds the life expectancy of a dishwasher to be 11 years. The standard deviation for the lifespan is 1 year. What percent of the washers will last from 9 to 13 years?
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z(9) = (9-11)/1 = -2
z(13) = (13-11)/1 = 2
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P(9<= x <=13) = P(-2<= z <= 2) = 0.9545...
Cheers,
Stan H.
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