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Probability

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A family has 4 children. The probability of having a boy is 50% (girl is the same 50%).
1) What is the probability that the family only has one boy?
2) What is the probability that the family only has three boys?
3) What is the probability that the family has at least one boy?
4) What is the probability that 4 children are girls?

Suppose that the probability that a person will develop hypertension over a lifetime is 20%.
5) What is the probability that 4 or 5 people develop hypertension over a lifetime among 20 students graduating from the same high school class?
6) What is the probability that exactly 3 people develop hypertension over a lifetime among 20 students graduating from the same high school class?
7) What is the probability that at least 2 people develop hypertension over a lifetime among 20 students graduating from the same high school class?

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The solution gives step by step procedure computing probability

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