The probability model below describes the number of repair calls that an appliance repair shop, may receive durng an he On average, the shop receives 2.7 calls an hour; witu a stanuerd deviation of 0.90 calls. Suppose that the appliance shop plans a 7 -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 (Type an integer or a decimal)