Suppose 20 of a population consists of people with blonde ha

Suppose 20% of a population consists of people with blonde hair. 8 people ar randomly selected from this population. Find the probability that exactly 2 of them have blonde hair.

Solution

P(At least one blonde) = 1 - P(no one is blonde)

Thus, here, as P(not blond) = 1-0.20 = 0.80,

P(At least one blonde) = 1 - P(no one is blonde)

= 1 - 0.80^8

= 0.83222784 [ANSWER]