SOLUTION: telephone answering devices. Seventy-seven percent of U>S> homes have a telephone answering device. In a random sample of 290 home, what is the probability that more than 50 do not

Question 529494: telephone answering devices. Seventy-seven percent of U>S> homes have a telephone answering device. In a random sample of 290 home, what is the probability that more than 50 do not have an answering device?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
telephone answering devices. Seventy-seven percent of U>S> homes have a telephone answering device. In a random sample of 290 home, what is the probability that more than 50 do not have an answering device?
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23% do not have answering device.
Binomial Problem with n = 290 and p(not) = 0.23
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P(51<= x <=290) = 1 - P(0<= x <= 50) = 0.9898
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Cheers,
Stan H.
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