# discrete math probability theory

• Oct 25th 2010, 01:09 PM
robasc
discrete math probability theory
Discrete probability?
refer to a fair coin that is repeatedly flipped. If the coin is flipped 10 times, what is the probability of at most five heads.

what formula do I use to solve this and how do i know what formula to use?

I really need some help, I do not understand this at all
• Oct 25th 2010, 01:14 PM
Plato
$\dbinom{10}{k}(0.5)^{10}$ is the probability of exactly k heads.

Now sum that $k=0\text{ to }5.$