Question

A fair coin is tossed five times. Find the probability that it shows exactly three times head.

Answer 1

Let X be the radom variable.
let 'p' be the success and 'q' be the failure

p=1/2, q=1/2

p(Coin shows 3 heads)

=p(x=3)=5c₃p³q²

= 10 (1/2)³(1/2)²

=10/32

=5/16