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probability using binomial distribution

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A recent survey indicated that 82% of single women aged 25 years old will be married in their lifetime. Using binomial distribution find the probability that 2 or 3 women in a sample of 20 will never be married.

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The solution shows how to find the probability that 2 or 3 women in a sample of 20 will never be married. See attachment for full details.

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