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8. Wayback Cleaning Co. has found that standard size offices have a standard deviation of 5...

8. Wayback Cleaning Co. has found that standard size offices have a standard deviation of 5 minutes for their cleaning time. The operations manager knows that 95 percent of the offices require more than 120 person-minutes to clean. However, she wishes to find out the average cleaning time for the off ices. Can you calculate that for her?

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