Daily sales records for a computer manufacturing firm show that it will sell 0, 1, or 2 mainframe computer systems with probabilities as listed Number of Sales 0 1 2 Probability 0.7 0.2 0.1 a. Find the probability distribution for X, the number of sales in a two-day period, assuming that sales are independent from day to day.   b. Find the probability that at least one sale is made in the two-day period.

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