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March 29, 2017

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A bag holds 2 yellow, 1 green, and 2 red marbles. If you were to draw a marble from the bag 150 times, and replace it after each draw, how many yellow marbles would you expect to draw? (1 point)
A:50
B:60
C:30
D:38


I say it's B or A

  • Math - ,

    Nvm i worked it out it's B

  • Math - ,

    Hmmm. I agree with that answer is best, but to get 60 marbles in 150 draws would very seldom happen. In fact, it happens with a frequency of only .0664. Getting exactly 59 or 61 is almost the same...0.0653 and .0569 frequency.
    http://ncalculators.com/statistics/binomial-distribution-calculator.htm

    Your probablity of success (getting yellow) is .4 in the above question.

    If your rich bud wanted to bet you a wager on getting exactly 60 yellow out of 150 tries, take him on, and make $$.

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