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Standard deviation of the number

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In any given month, the pro shop at a golf club can either sell 36 dozen balls or 21 dozen balls. The probability that the pro shop sells 36 dozen balls is 0.59; otherwise, the pro shop sells 21 dozen balls. What is the standard deviation of the number of balls the pro shop sells in a month? (please round your answer to 2 decimal places)

Reference no: EM131087381

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