When the salesperson makes a sale, there are three possible sales levels: large, medium, and small. The probability of a large sale is 0.20 and the chance of a medium sale is 0.60. If a salesperson makes two sales, the probability that at least one is large is 0.36.

Question

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The probability of not making a large sale is 0.80. The probability of not making a large sale in two sales is 0.80 * 0.80 = 0.64. The probability of making at least one large sale is 1 - 0.64 = 0.36.

When the Salesperson Makes a Sale, There Are Three Possible