3. Of all customers purch asi ng automatic gr age-door openers, 60% purchase a ch ain -driven model. Let X - the number among the next 15 purch as ers who select the ch ain -driven model. (a) Wh at is the probability th at more th an 12 of the 15 purch asers neloct a ch ain- driven mo del? (b) purch ase a ch ain-driven model? Wh at is the probability th at fower th an 5 of the next 15 purchasors do not (c) Caleulate P(9 S X < 13) (d) the chain driven model is within one st and ard deviation of the expected value of X? Wh at is the probability th at the number of the next 15 purchasers who select

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3. Of all customers purch asing automatic ga age-door openers, 60% purchase a chain-driven model.
Let X - the number among the next 15 purch as ers who select the ch ain -driven model.
Wh at is the probab il ity that more th an 12 of the 15 purch asers select a ch ain-
(a)
driven mo del?
(b)
purch ase a ch ain -driven model?
Wh at is the probability that fewer th an 5 of the next 15 purchasers do not
(c)
Calculate P(9 < X < 13)
Wh at is the probability that the nu mber of the next 15 purchasers who select
(d)
the chain driven model is wit hin one st and ard deviation of the expected value of X?
Transcribed Image Text:3. Of all customers purch asing automatic ga age-door openers, 60% purchase a chain-driven model. Let X - the number among the next 15 purch as ers who select the ch ain -driven model. Wh at is the probab il ity that more th an 12 of the 15 purch asers select a ch ain- (a) driven mo del? (b) purch ase a ch ain -driven model? Wh at is the probability that fewer th an 5 of the next 15 purchasers do not (c) Calculate P(9 < X < 13) Wh at is the probability that the nu mber of the next 15 purchasers who select (d) the chain driven model is wit hin one st and ard deviation of the expected value of X?
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