A chemical supply company currently has in stock 100lb of a certain chemical, which it sells to customers in 5-lb batches. Let X be the number of batches ordered by a randomly chosen customer, and suppose that X has pmf X 1 2 3 4 f (x) 0.2 0.4 0.3 0.1 a. Compute E[X] and Var[X] b. Compute the expected number of pounds left after the next customer's order is shipped and the variance of the number of pounds left
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