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31 December, 15:55

In a bag, there are two blue tokens, three red tokens, six yellow tokens, and four green tokens. Stephen will perform random trials of drawing a token and replacing it into the bag. Which of the following is a good prediction for the number of times a red or green token will be drawn in 300 trials?

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  1. 31 December, 16:20
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    Well the more trials that you perform the closer you get to theoretical probability which is just:

    P (E) = (number of specific Events or outcomes) / (total number of possible outcomes)

    P (Red) = (number of red tokens) / (total number of tokens)

    P (R) = 3/15

    P (G) = 4/15

    So the probability of red OR green is:

    P (RorG) = 3/15+4/15=7/15

    So in three hundred trials you should expect to draw red or green:

    300 (7/15) = 140 times.
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