To make a ratio… Chance of the event total number Lesson 6.6 Concept: How to find the probability of an event Guidelines: Probability can be expressed as a ratio or a decimal. To make a ratio… Chance of the event total number To change the ratio to a decimal…divide! Bottom number top number

Practice: Find the probability. Express it as a ratio and a decimal. 1 2 What is the chance of the spinner landing on the 3? 6 3 1 chance of landing on a “3” 5 4 6 total number of places 1. Create a ratio. 2. Divide to make a decimal. 0. 16 6 ) 1 .00 - 6 40

Find an experimental probability… About how many times can you expect the pointer to land on “3” in the next 50 spins? Use two ratios and cross products to predict 1 = x 6 50