SOLUTION: "An urn contains 7 red marbles, 2 green marbles, and 5 black marbles. If a single marble is drawn from the urn, what is the probability that it is black?" I'm not sure how to so

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Question 188176: "An urn contains 7 red marbles, 2 green marbles, and 5 black marbles. If a single marble is drawn from the urn, what is the probability that it is black?"
I'm not sure how to solve this. Please explain it the best you can.
Thank you :)
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
successful events divided by possible events
:
there are a total of 14 marbles in the urn...that is possible events
:
there are a total of 5 black marbles in urn...that is successful events
:
P(black)= 5/14 so the probability of choosing a black is 5 out of 14