If one flips 5 unbiased coins once, what is the probability of getting exactly 3 heads?
A) 0.6000
B) 0.3125
C) 0.4687
D) 0.0312

Question

Quizplus · Accepted Answer

The total number of possible outcomes is 2 to the power of 5, which is 32.
To get exactly 3 heads, we can either have HHHHT, HHHTH, HHTHH, HTHHH, or THHHH.
Each of these outcomes has a probability of (1/2)^5, which is 1/32.
Therefore, the probability of getting exactly 3 heads is: 5/32 or 0.3125.

If One Flips 5 Unbiased Coins Once, What Is the Probability