It is reported that 14% of American households use a cell phone exclusively for

Question

It is reported that 14% of American households use a cell phone exclusively for their telephone service. In a sample of ten households, find the probability that:

No household uses a cell phone as their exclusive telephone service. (Round your answer to 4 decimal places.)

Exactly 4 households exclusively use a cell phone for telephone service. (Round your answer to 4 decimal places.)

Find the mean number of households exclusively using cell phones. (Round your answer to 4 decimal places.)

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It is reported that 14% of American households use a cell phone exclusively for their telephone service. In a sample of ten households, find the probability that:

Explanation / Answer

a. From information given, 0.14 American use cell phone xclusively, therefore, 0.86 American donot use cell phone exclusively.

P(none American using cell phone)=(0.86)^10=0.2213

b.

P(X=4)=(0.14)^4*(0.86)^6=0.0001

c. E(X)=10*0.14=14

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