The Chicken Oil Company in Bryan, Texas is famous for a hamburger loaded with jalapeño peppers and Tabasco sauce that they call the "Deathburger." The latest sales figures indicate that 35% of their customers order the Deathburger. Suppose 20 customers are selected at random.
a. what is the probabilty that exactly 9 customers will order Deathburgers?
b. What is the probabilty that 7, 8, or 9 customers will order Deathburgers?
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