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According to a​ survey, 26.8​% of​ credit-card-holding families in a certain area hardly ever pay off...

According to a​ survey, 26.8​% of​ credit-card-holding families in a certain area hardly ever pay off the balance. Suppose a random sample of 28 credit-card-holding families is taken. Find the probability that at least 4 families hardly ever pay off the balance.

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