Thread: Math Contest Problem 3

This problem is from the 2002 Luzerne County Math Contest:
Assume a person flips five fair coins. What is the probability of obtaining at least 4 heads?
Is there any way to do this problem without listing all the possibilites? Thanks in advance!

Originally Posted by eric1299171

This problem is from the 2002 Luzerne County Math Contest:
Assume a person flips five fair coins. What is the probability of obtaining at least 4 heads?
Is there any way to do this problem without listing all the possibilites? Thanks in advance!

The number of heads in five flips is a binomial random variable , and you are asked to find:



CB

Thanks for the reply! I looked up the formula in a probability book I had. =)