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March 27, 2017

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A bag contains 5 red, 3 green, 12 white and 7 blue marbles. One is drawn at random. With is the probability it is green if it is not red or blue?

  • Probabilities - ,

    This conditional probability
    the formula is
    P(A│B), read the prob of A given B
    = P(A and B)/P(B)

    in your case Prob(A) is Prob(green)
    B is "not red or blue"

    so find Prob(green AND "not red or blue")
    and Prob(not red or blue) and sub into the formula

  • Probabilities - ,

    There'sa100 red 50 green and 50 blue beads in a jar what's the probability that I'll pull out a blue bead

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