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Time to finish the job

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An employer wants 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 28 minutes with a standard deviation of 5 minutes. How much time should the employer allow employees to finish the job? (Round up to the nearest minute.)

Answers:
40
37
29
35

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This solution goes through how to calculate how much time should an employer allow employees to finish a job given several statistical parameters.

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