SOLUTION: The probability that a birth will result in twins is 0.015 . Assuming independence​ (perhaps not a valid​ assumption), what is the probability that out 190 births in a​ hosp

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Question 1168766: The probability that a birth will result in twins is 0.015 . Assuming independence​ (perhaps not a valid​ assumption), what is the probability that out 190 births in a​ hospital, there will be exactly 2 sets of​ twins?
Answer by ikleyn(52866) About Me  (Show Source):
You can put this solution on YOUR website!
.
It is the binomial type probability distribution.


The number of trial n= 190; the probability of the success trial is  0.015,  and the number of success trial k = 2. 


P = C%5B190%5D%5E2%2A0.015%5E2%2A%281-0.015%29%5E%28190-2%29 = %28%28190%2A189%29%2F%281%2A2%29%29%2A0.015%5E2%2A0.985%5E188 = 0.235711.     ANSWER

Solved.

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To see many other similar solved problems, look into the lessons
    - Simple and simplest probability problems on Binomial distribution
    - Typical binomial distribution probability problems
in this site.