1. ## Probability Question

A fair coin is tossed 3 times. Find the probability of getting:
c.)exactly one tail

I know i have to use the formula $nCr p^r q^(n-r)$
for part a.) n=3
r=2
p=?
q=?

I don't know how to find p and q

2. Originally Posted by ~berserk
A fair coin is tossed 3 times. Find the probability of getting:
c.)exactly one tail

I know i have to use the formula $nCr p^r q^(n-r)$
for part a.) n=3
r=2
p=?
q=?

I don't know how to find p and q
p = 0.5 and q = 1-p, so in this case they're both 0.5