SOLUTION: It is reported that 16 percent of American households use a cell phone exclusively for their telephone service. In a sample of eight households, find the probability that: a)

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Question 363999: It is reported that 16 percent of American households use a cell phone exclusively for their telephone service. In a sample of eight households, find the probability that:

a) None use a cell phone as their exclusive service.
b) At least one uses the cell exclusively.

(c) At least five use the cell phone.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
It is reported that 16 percent of American households use a cell phone exclusively for their telephone service. In a sample of eight households, find the probability that:
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Binomial Problem with n = 8 and p = 0.16
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a) None use a cell phone as their exclusive service.
P(x=0) = 0.84^8
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b) At least one uses the cell exclusively.
P(at least one uses) = 1 - P(none use)
= 1 - 0.84^8
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(c) At least five use the cell phone.
P(5<= x <=8) = 1 - P(0<= x <=4) = 1 - binomcdf(8,.16,4) = 0.0038
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Cheers,
Stan H.