1. Lesson 3

1.7. Explore 6

Mathematics 30-2 Module 2

Module 2: Probability

 

From Try This 4, you can summarize calculating the probability of two dependent events as follows:

 

When two events, A and B, are dependent, the probability of both occurring is


 

P(B|A) is the notation for conditional probability. It should be read as “the probability of event B happening, given that event A has already occurred.”

 

The formula can be manipulated in the following ways:

 

 



textbook

To see how this formula is used in a real-life scenario, turn to pages 182 and 183 of your textbook. Go over “Example 1.” Pay particular attention to the tree diagram on page 182 and how the formula is used to calculate the answer on page 183.

 

Self-Check 4
  1. Answer “Reflecting” questions A, B, C, D, and E on page 183 of your textbook. Answer
  2. Complete question 7 on page 189 of your textbook. Answer