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) (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 \ =\ {{n}\choose{x}}\,\(p\)^x\,\(1-p\)^{n-x})
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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