p5

Of all customers purchasing automatic garage-door openers, 75% purchase a chain-driven model. Let X = the number among the next 15 purchasers who select the chain-driven model. LA USE SALT (a) What is the pmf of X? O h(x; 12, 15, 75) O b(x; 15, 0.25) O h(x; 3, 15, 75) O b(x; 15, 0.75) O nb(x; 15, 0.75) O nb(x; 15, 0.25) (b) Compute P(X > 10). (Round your answer to three decimal places.) P(X > 10) = (c) Compute P(6