A bank has a drive-through service. The number of customers arriving during a 15-minute period is distributed

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A bank has a drive-through service. The number of customers arriving during a 15-minute period is distributed as shown. Find the mean, variance, and standard deviation for the distribution.

Number of customers X Probability P(X) 3 4 0.25 0.12 0.20 0.31 0.12

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