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If the customers purchasing laptops, 75% purchase a Dell model. Let X= the number among the...

If the customers purchasing laptops, 75% purchase a
Dell model. Let X= the number among the next 5
purchasers who select the Dell model.
a) What is the pdf of X?
b) Compute P(X > 4) and P(2 £ X < 4).
c) Compute the mean and the variance of X.

Math   Statistics-And-Probability   
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