SOLUTION: An employer wants to estimate to set a time limit so that 90% of the employees will finish a job on time. Past history has shown that the time required to do the job is normally di

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Question 912227: An employer wants to estimate to set a time limit so that 90% of the employees will finish a job on time. Past history has shown that the time required to do the job is normally distributed and has a mean time of 32 minutes with a standard deviation of 6 minutes. How much time should the employer allow employees to finish the job?
Answer by stanbon(75887) About Me  (Show Source):
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An employer wants to estimate to set a time limit so that 90% of the employees will finish a job on time. Past history has shown that the time required to do the job is normally distributed and has a mean time of 32 minutes with a standard deviation of 6 minutes. How much time should the employer allow employees to finish the job?
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Find the z-value with a left tail of 0.90
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invNorm(0.90) = 1.2816
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Find the corresponding time value:
x = z*s + u
Ans::x = 1.2816*6 + 32 = 39.69 minutes
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Cheers,
Stan H.
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