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A box has 7 large red marbles, 5 large yellow, 3 small red, 5 small yellow, if marble drawn random probability
A box has 7 large red marbles, 5 large yellow, 3 small red, 5 small yellow marbles. If a marble is drawn at random, what is the probability that it is yellow, given that it is one of the large marbles?
answer is 5/12, how do i get that answer?
This is called a conditional probability (you're "given" something - that it's a large marble)
So, first we figure out the probability of getting a large AND yellow marble: 5/20 or 1/4
Then we divide that by the probability of getting a large marble in general (the "given" part), which is 12/20 or 3/5
When you divide 1/4 by 3/5, you get 5/12! 
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