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The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour. Repair Calls 0 2 3 D Probability 0.2 0.3 0.3 0.2 On average, the shop receives 1.5 calls an hour, with a standard deviation of 1.02 calls. Suppose that the appliance shop plans an 8-hour day. Complete parts (a) through (d) below. (a) Find the mean and standard deviation of the number of repair calls they should expect in a day. The mean number of repair calls they should expect in a day is 11 2 (Type an integer or a decimal.) The standard deviation of the repair calls they should expect in a day is 2.59 (Round to two decimal places as needed.) (b) What assumption did you make about the repair calls? O.A. The shop is open on weekends, O B. Each call lasts less than 1 hour. O C. The hours are independent. O D. The shop receives the same number of calls each day