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Please help me on this 1. Of all customers purchasing automatic garage-door openers, 65% purchase a chain-driven model. Let X = the number among the

Please help me on this

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1. Of all customers purchasing automatic garage-door openers, 65% purchase a chain-driven model. Let X = the number among the next 15 purchasers who select the chain-driven model. (3 points each) a. Calculate P(X > 11). b. Calculate P(9 S X $ 13). c. Calculate the variance of this distribution

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