SOLUTION: A fair coin is flipped three times. Find the probability that it will come up heads at least twice?

Algebra ->  Probability-and-statistics -> SOLUTION: A fair coin is flipped three times. Find the probability that it will come up heads at least twice?       Log On


   

Question 539643: A fair coin is flipped three times. Find the probability that it will come up heads at least twice?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A fair coin is flipped three times. Find the probability that it will come up heads at least twice?
--------
P(x = 2 or x = 3) = 3C2(1/2)^3 + 3C3(1/2)^3 = 3/8 + 1/8 = 4/8 = 1/2
=========
Cheers,
Stan H.