Question

The probability of a certain baseball player hitting a foul ball is 1/5. How many foul balls would you expect her to hit after 90 swings?

Answer 1

The expected number of foul balls is equal to the probability of hitting a foul ball multiplied by the number of swings.

Expected number of foul balls = probability of hitting a foul ball x number of swings

Expected number of foul balls = (1/5) x 90

Expected number of foul balls = 18

Therefore, we would expect the baseball player to hit 18 foul balls after 90 swings.