In a group of 120 people, 90 have an age of more 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?

First solve for the number of people whose age is less than 20 by subtracting 90 from 120: 120 - 90 = 30. Then show the probability (P) that a person selected at random from the group is less than 20 is given by dividing 30 by 120: 30 / 120 = 0.25.

Asked by Tom Tennant · Last updated 5 years ago · 2.4K views · SOURCE