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Cell phone probability analysis

According to an article appearing in the Wall Street Journal, about 70% of all U.S. households have a cellular phone. suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:

(a) every household has a cellular phone?
(b) more than four households have a cellular phone?
(c) fewer than 5 do not have a cellular phone?
(d) more than 7 do not have a cellular phone?

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