*7. The lead time for receiving an order can be 1 or 2 days, with equal probabilities. The demand per day assumes the values 0, 1, and 2 with the respective probabilities of .2, .7, and

.1. Use the random numbers in Table 16.1 (starting with column 1) to estimate the joint distribution of the demand and lead time. From the joint distribution, estimate the pdf of demand during lead time. (Hint The demand during lead time assumes discrete values from 0 to 4.)