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The probability distribution of the number of customers waiting for service at a post office queue at 10:00 on weekdays in June is X 2

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The probability distribution of the number of customers waiting for service at a post office queue at 10:00 on weekdays in June is X 2 3 4 5 P (X ) 0.15 0.25 0.21 (0.45-0.25) 0.11 0.08 What is the variance of this distribution? (Give your answer correct to four decimal places)

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