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Probability of choosing a 1st grade boy over others

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There are 90 1st and 2nd graders on the playground. 50 are 1st graders and 40 are second graders. 75 are boys. One is picked at random, what is the probability of choosing a 1st grader boy?

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The probability of choosing a 1st grade boy over others is determined.

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Here you have to compute the probability of choosing a 1st grade boy.

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