A person has a coin in which lands with a head showing 30% of the time. Express as a decimal the probability that she gets 2 heads and 1 tail when she tosses the coin 3 times.
So if a coin is flipped 10 times a head is shown 3 times and the tail is shown 7 times.
But I dont know how to continue
This is a bimomial probability problem
We flip the coin 3 times and we need to choose 2 of them to be heads....
So we have
C(3,2) (.30)^2 (.70) = 189/1000 = .189 = 18.9%