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A health club lets members use, on each visit, its facilities for as long as they...

A health club lets members use, on each visit, its facilities for as long as they wish. The club’s records suggest that the length of a visit can be modelled by a Normal distribution with mean µ = 90 minutes. Only 20% of members stay for more than 120 minutes. The standard deviation is (A) 37.5 minutes (B) 25.8 minutes (C) 35.7 minutes (D) 30 minutes

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