Question

What is the probability of flipping a coin 7 times and getting heads 6 times

Answer 1

5.5%

Explanation:

Find nCx=7C6=7

Then find (nCx)(P^x)(Q^n-x)=(7)(0.5^6)(0.5^1)=0.0546=5.5%

Answer 2

7/128 or 5.46875%

Explanation:

There are 2^7, or 128 combinations and only 7 of them have 6 heads. So the probability is 7/128, or 5.46875%.