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Math Help - Beginning Probablity Problem

  1. #1
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    Beginning Probablity Problem

    Of the volunteers coming into a blood center, 1 in 3 have o+ blood, 1 in 15 have o-, 1 in 3 have A+ and 1 in 16 have A-. The name of one person who previously has donated blood is selected from the records of the center. What is the probabilty that the person selected has

    o+ blood?

    My problem is that I am not sure how many total people gave blood. Can someone show? Thanks
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  2. #2
    MHF Contributor harish21's Avatar
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    The answer is in the question itself..

    it says 1 in 3 has O+ blood group.. so what is the probability?
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  3. #3
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    Yeah I figured it out... Stupid question. Thanks tho
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