Question 1166124: A fair coin is flipped four times and the observations recorded. Event A = Observing at least two heads. What is P(A)?
Write your answer as a fraction in reduced form.
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website!
There are exactly 16 different outcomes of flipping a coin four times:
One way to get all four heads, four ways to get 3 heads, six ways to get 2 heads, four ways to get 1 head, and one way to get 0 heads.
H H H H 4 H, 0 T
H H H T 3 H, 1 T
H H T H
H T H H
T H H H
H H T T 2 H, 2 T
H T H T
H T T H
T H H T
T H T H
T T H H
T T T H 1 H, 3 T
T T H T
T H T T
H T T T
T T T T 0 H, 4 T
11 of these 16 outcomes have two or more heads.
John
My calculator said it, I believe it, that settles it
I > Ø
|
|
|
