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The probability of choosing 2 girls at random from group of 25 students of which

10 are girls and 15 are boys is:

P( 2 girls) = (10/25)∙(9/24) = 3/20 = 0.15 = 15%

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What is the probability a girl is chosen if 15 students are girls and 10 students are boys?

The ratio of girls to total students is 15:25, or 3:5. Three out of five students are girls so there would be a 60% probability that a girl would be chosen; a 2 out of 5 chance, or 40% probability that a boy would be chosen.


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