SOLUTION: For every 3 white marbles in the bag there are 7 black marbles. If Margaret pulls out a marble 50 times and always replaces it how many times would you expect her to pull out a bla
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Question 400386: For every 3 white marbles in the bag there are 7 black marbles. If Margaret pulls out a marble 50 times and always replaces it how many times would you expect her to pull out a black marble? Answer by robertb(5830) (Show Source):
