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by candygal79 » Thu Apr 03, 2014 3:20 am
48 % male students , 52 % female students in a school.In a graduating class, there was 40 % male and 20 % female who are 25 years and older. If one of the student in the graduating class is random selected, approx what is the probability he/she will be less than 25 years ?
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by [email protected] » Thu Apr 03, 2014 9:10 pm
Hi candygal79,

The question is perfect for TESTing VALUES.

Normally, I would test the number 100, but since this question asks us to deal with percents OF percents, I'm going to use 1,000.

Total students = 1,000
Total males = 480
Total females = 520

Males over 25 = 40%(480) = 192
Females over 25 = 20%(520) = 104

Total People OVER 25 = 296
Total People UNDER 25 = 1000 - 296 = 704

Probability of randomly selecting a person under 25 = 704/1000 = [spoiler]70.4%[/spoiler]

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