Question

If a fair coin is tossed 9 times, what is the probability, to the nearest thousandth, of getting exactly 1 heads?

Answer 1

Prob(head) = 1/2

prob(not head) = 1/2

prob(exactly 1 head out of 9) = C(9,1)(1/2)^1 (1/2)^8
= 9/512