Doug Brackett wants to have enough mechanics on hand to take care of his customer requests, but

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Doug Brackett wants to have enough mechanics on hand to take care of his customer requests, but he does not want to be paying mechanics to sit around doing nothing. Doug needs to know a reasonable upper limit on the number of customers so he can plan his staff schedule. About 97.5% of the time, what is the maximum number of customers Doug should plan for?
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