Question: Suppose the probability that a person will develop hypertension over a life time is 0.2. What is the probability that exactly one (1) hypertensive over

Suppose the probability that a person will develop hypertension over a life time is 0.2. What is the probability that exactly one (1) hypertensive over a lifetime among 20 students graduating from the same high school class?

I know the answer but I'm a bit confused on how we got 0.0576 as the answer

thank you!

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