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.
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?
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