# Find the probability and odds of simple events.

## Presentation on theme: "Find the probability and odds of simple events."— Presentation transcript:

Find the probability and odds of simple events.

The probability of an event—the ratio of the number of favorable outcomes for the event to the total number of possible outcomes. EXAMPLE: When you flip a coin, there are two possible outcomes. The probability of getting a heads is 1:2 or

Sample space—list of all possible outcomes.
When you roll a die, there are six possible outcomes: 1, 2, 3, 4, 5, or 6. What is the sample space of spinning this spinner?

When there are n outcomes and the probability of each one is 1 𝑛 , we say that the outcomes are equally likely. For example, when you roll a die, the 6 possible outcomes are equally likely because each outcome has a probability of The probability of an event is always between 0 and 1, inclusive. The closer a probability is to 1, the more likely it is to occur.

A die is rolled. Find each probability. a. rolling a 1 or 5
𝟐 𝟔 𝒐𝒓 𝟏 𝟑 b. rolling an even number 𝟑 𝟔 𝒐𝒓 𝟏 𝟐

A bowl contains 5 red chips, 7 blue chips, 6 yellow chips, and 10 green chips. One chip is randomly drawn. Find each probability. a. blue 1 4 11 28 b. red or yellow 9 14 c. not green

One method used for counting the number of possible outcomes is to draw a tree diagram. The last column of a tree diagram shows all of the possible outcomes.

Fundamental Counting Principle

Assignment: page P36 (front of book) all.