SOLUTION: In a given city, the probability that a given person is taller than 180 cm is 0.25 a) If 18 people are chosen, what is the probability that at least 3 are taller than 180 cm?

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Question 1180991: In a given city, the probability that a given person is taller than 180 cm is 0.25
a) If 18 people are chosen, what is the probability that at least 3 are taller than 180 cm?
b) If 18 are chosen, what is the expected number of people who are taller than 180 cm?
Answer by Solver92311(821) About Me  (Show Source):
You can put this solution on YOUR website!


The probability of successes in independent trials where the probability of success on any given trial is is given by

You want the probability of 3 successes in 18 trials where the probability of success on any given trial is 0.25. You can do your own arithmetic.

The mean of a binomial distribution is

John

My calculator said it, I believe it, that settles it

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