According to the Bureau of Standards, 75 percent of all people have inner belly buttons, everyone el


Question: According to the Bureau of Standards, 75 percent of all people have inner belly buttons, everyone else is an outer. Let the random variable x be the number of outers among 7 randomly selected persons.

A. Find the probability that exactly 2 of the 7 persons are outers.

B. Find the probability that no more than 6 of the 7 are outers.

C. Find the probability that none of the 7 is an outer.

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