Posted by kaylee on Monday, January 25, 2010 at 8:39pm.
drawing a red checker from bag of 9 black checksrs and 6 red checkers, replacing it and drawing another red checker

math  PsyDAG, Tuesday, January 26, 2010 at 10:38am
The probability of drawing a red checker = # of red checkers/total. Since the red checker is replaced, the probability of drawing red the second time is the same.
The probability of both/all events occurring is found by multiplying the probabilities of the individual events.
I hope this helps.

math  John, Wednesday, January 27, 2010 at 12:23pm
Billy takes two marbles, without replacement, from a bag that contains only six yellow marbles and three blue marbles.
What is the probability that he gets one marble of each color?
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