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Example 9.2: Mr. XIN sells new cars. He usually sells the largest number of cars on Saturday. He has developed the following probability distribution for the number of cars he expects to sell on a particular Saturday. On a typical Saturday, how many cars does he expect to sell? What is the variance of the distribution? Number of Cars Sold, Probability, P(x) U 2 3 4 Total 0.10 020 0.30 0.30 0.10 1.00