A chemical supply company currently has in stock 100 lb of a certain chemical, which it sells to customers in 5-lb batches. Let X = the number of batches ordered by a randomly chosen customer, and suppose that X has pmf

Compute E(X) and V(X). Then 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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4 p(x) .2 .3