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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?



The probability is 0.25.
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Since there are a total of 120 people...out of them 90 are above 30yrs...so remaining are less than 20yrs...So probability of having someone less than 20 is (120-90)/120

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