Notes 13-5: Conditional Probability

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Presentation transcript:

Notes 13-5: Conditional Probability

Example 1: A container holds 4 blue marbles and 5 red marbles 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 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.

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