George flips an unfair coin 7 times. The coin has a probability of 1/4 coming up heads and a probability of 3/4 coming up tails. What is the probability that he flips exactly 2 tails?
P(T)=3/4 =0.75 find P of 2tails in 7 flips
7C2 * (0.75)^2 * (0.25)^5
