Q7 (10 points) A car dealer claims that on average they sell 2 cars per day. a) Find the mean and standard deviation of the daily sales of the dealer. b) What is the probability that the dealer makes no sale in a day? c) If this dealer has only 3 cars available to sell in a day, what is the probability that the dealer is not able to provide the customers demanding a car in the same day? d) What is the probability that the dealer makes more than 3 sales during a period 5 days