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Math Help - Help I'm so confused. (Probability)

  1. #1
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    Exclamation Help I'm so confused. (Probability)

    You are working for a carnival game tester. For one carnival game, 50 plastic discs are put into a can. Twenty (20) disks are red, 15 are blue, 10 are green, and 5 are yellow. The carnival directors want you to tes the probability of certain outcomes for the game. In each game described, the discs are mixed randomly and pulled without looking.

    In one version of the game, one disc is pulled, the color noted, and that disc is placed back in the can. Then the second disc is pulled.

    1) What is the probability of pulling two red disks? Show work using words or numbers.

    2) What is the probability of pulling a blue disk, then a green disk? Show work using words or numbers.

    In the second game, one disc is pulled, the color is noted, and that disc is set asideand not placed back in the can. Then the second disk is pulled.

    3) What is the probability of pulling two red disks out? Show work using words or numbers.

    4) What is the probability of pulling a blue disk, then a green disk? Show work using words or numbers.




    Please help me
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  2. #2
    MHF Contributor
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    If you put it back, the trials are independent.

    Pr(A and B) = Pr(A)*Pr(B)

    1) Pr(2 red) = Pr(Red)*Pr(Red) = (20/50)*(20/50)

    You do the rest.
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