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Question

n 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?

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Solution

Dear student
Number of people whose age is less than 20 is given by 120-90=30Probability P that a person selected at random from the group is less than 20 is given by 30120=14
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