Lesson 1

Read “Example 1” on page 143 to see another example of how to calculate the odds. As you read, note how set notation is used to indicate the cards you are interested in choosing. The set notation used in the example is related to the odds formula:

Self-Check 1

1. Complete “Your Turn” on page 143 of your textbook. Answer
2. What is the probability of not drawing a heart in a random draw from a standard deck of 52 playing cards? Answer
3. The probability that it will rain in Edmonton today is 0.53. What is the probability that it will not rain in Edmonton today? Answer
4. Answer question 3 on page 148 of your textbook. Answer

In Try This 2 you were given information, and, from that, you calculated the probability and the odds. What if the information was not given, only the probability? How can you get the information you need in order to determine the odds? The following activity shows how odds can be determined from a probability statement.

Try This 3

There is a 10% probability of winning a free play in the charity draw.

1. Write 10% as a fraction.
2. If 100 tickets are purchased, theoretically how many tickets would win a free play?
3. If 100 tickets are purchased, theoretically how many tickets would not win a free play?
4. Based on a 100 tickets being sold, what are the odds in favour of winning a free play? Write your answer as a ratio; then write it as a reduced ratio.
5. Describe in words the information you can gain from knowing the probability of an event and how this information helps you write the odds for the event.

Save your responses in your course folder.