# Probability question

• Sep 23rd 2007, 03:47 PM
clockingly
Probability question
The following was confusing me, so any help would be appreciated!

Suppose we throw a fair coin 3 times. Let X be the number of heads. Find the probability distribution function of X.
• Sep 23rd 2007, 06:02 PM
Plato
$P(X) = {{3}\choose {X}} \left( {.5} \right)^3 ,\quad X = 0,1,2,3$