Notes 13-5: Conditional Probability
Example 1:
A container holds 4 blue marbles and 5 red
marbles. One marble is randomly drawn and
discarded. Then a second marble is drawn.
What is the probability that the second
marble is red, given that the first was blue?
Example 2:
A pair of number cubes is thrown. Find the
probability that the numbers match given
that their sum is greater than or equal to 9.