theboyisthekid theboyisthekid

14-05-2018
Mathematics

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A bag contains 18 red marbles, 2 white marbles, and 7 gray marbles. You randomly pick out a marble, record its color, and put it back in the bag. You repeat this process 81 times. How many white or gray marbles do you expect to get?

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popalabdulqayou popalabdulqayou

14-05-2018

Lets Red r, White w, Gray g

r+w+g= 18+2+7=27

9/27=.33

.33* 81 =27 white and gray marble

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