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Math Help - expected value and standard dev

  1. #1
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    expected value and standard dev

    In a box there are 25 marbles, 15 of which are red, 13 made of clay (only
    6 of these are red). We randomly select 8 marbles without replacement.
    If
    U (V ) is the number of red (clay) marbles in our sample, find:

    a) the expected value and standard deviation of 2U 3V + 4
    b) Pr(3U = V )
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  2. #2
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    ok im pretty sure i got b. but a is still in question

    would it just be 2(15C8)/(25C8) - 3(13C8)/(25C8) + 4 for the expected value
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