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If A bag contains 3 orange 5 black and 2 white marbles Two marbles are drawn but the first marble is not replaced Find P white then black?
Wiki User
∙ 12y ago
Bag with 10 marbles: 3 orange, 5 black, 2 white.
Rephrasing the question.
If a marble is drawn from the bag, then returned to the bag, and a second marble
is drawn, what is the probability that the first marble turns out white and the second
marble black ?
The probability for a marble to come out white from the bag is:
P(W) = 2/10 = 1/5
The probability for a marble to come out black from the bag is:
P(B) = 5/10 = 1/2
The probability for a marble to come out white, put back in the bag and then take again a marble for a second time and turns out to be black is:
P(B2|W1) = (1/5)∙(1/2) = 1/10 = 0.10 = 10 %
Wiki User
∙ 12y ago
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