SOLUTION: Need to know how to solve the following: The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.

Question 802786: Need to know how to solve the following:
The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.
What is the probability that a randomly selected watch will be in working condition for more than five years?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.
What is the probability that a randomly selected watch will be in working condition for more than five years?
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z(5) = (5-4)/8 = 1/8
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P(x > 5) = P(z> 1/8) = normalcdf(1/8,100) = 0.4503
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Cheers,
Stan H.
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