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George flips an unfair coin 7 times. The coin has a 1/4 probability of coming up heads and a 3/4 probability of coming up tails. What is the probability that he flips exactly 2 tails?

Guest Aug 1, 2017
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This is a binomial probability problem.......the probability is given by :

 

C (7, 2) * ( 1/4)^5 (3/4)^2  = 189 / 16384  ≈ .0115   ≈  1.15%

 

 

cool cool cool

CPhill  Aug 1, 2017

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