1. Do Now
The average wait time for a roller coast is 120 minutes. The standard deviation in wait time is 5 minutes.
a. Set up a Normal curve that represents this distribution.
b. Suppose the standard deviation changes to 10 minutes. Set up a new Normal curve. How has the curve changed?

2. Normal Distribution: Empirical Rule
Unit 4: Inferences

3. Objectives
Use the Empirical Rule to determine what percent of the population falls between standard deviations of the Normal Distribution
GRIT
Works independently with focus
RESPECT
Knows when and how to include others
RESPONSIBILITY
Gets to work right away rather than procrastinating
LOVE OF LEARNING
Is eager to explore new things

4. The Empirical Rule

5. Check for Understanding
The average height of an American is 68 inches with a standard deviation of 3.14 inches.
What percent of Americans are between and inches tall?
How tall are 95% of Americans?

6. Guided Practice
In an Oreo factory, the mean mass of a cookie is given as 40 g. For quality control, the standard deviation is 2 g. If 10,000 cookies were produced, how many cookies are within 2 g of the mean? Cookies are rejected if they weigh more than 44 g or less than 36 g. How many cookies would you to be rejected in a sample of 10,000 cookies?

7. Independent Practice and Homework