SOLUTION: if a marble is chosen at random from a bag containing 9 white marbles and 3 black marbles, what is the probability that the chosen marble is white?

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Question 455965: if a marble is chosen at random from a bag containing 9 white marbles and 3 black marbles, what is the probability that the chosen marble is white?
Answer by edjones(8007) About Me  (Show Source):