When parking a car in a downtown parking lot, drivers pay according to the number of hours or fraction thereof. The probability distribution of the number of hours cars are parked has been estimated as follows:   X 1 2 3 4 5 6 7 8 P(X) 0.2 0.141 0.119 0.088 0.054 0.029 0.036 0.333 A. Mean =  B. Standard Deviation =  The cost of parking is 2.25 dollars per hour. Calculate the mean and standard deviation of the amount of revenue each car generates. A. Mean =  B. Standard Deviation =

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