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In a group of 120 people, 90 have an age of more than 30 years, and the others have an age of less than 20 years. If a person is selected at random from this group, what is the probability the person's age is less than 20?
30 of the 120 have an age less than 20 years Right so
Randomly choosing one, and the probability is 1 in 4 or .25 or 25%
