Seudónimo Seudónimo

05-04-2017
Mathematics

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There are 3 red, 2 blue and 5 green marbles in a bag. William randomly chooses a marble and puts it back into the bag. He repeats the process 70 times. How many times should William expect to draw a red marble?

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itsatrejobruh itsatrejobruh

05-04-2017

21 times, since all the marbles add up to 10 so 10 divided by 70 equals 7 so 3 (red marbles) times 7 equals 21.

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