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:A. Mean=B. Standard Deviation=The cost of parking is 5 dollars per hour. Calculate the mean and standard deviation of the amount of revenue each car generates. A. Mean=B. Standard DeviationX 1 2 3 4 5 6 7 8P(X) 0.229 0.113 0.114 0.076 0.052 0.027 0.031 0.358