1. Lesson 4

1.5. Explore 4

Mathematics 20-2 Module 4

Module 4: Statistical Reasoning

 

tip

The entire area under the normal curve is 100% or 1.

 

Let’s consider the muffler company again. Suppose the muffler company wanted to determine how many Millennium Mufflers had a lifetime of at least 9.25 years.

 

Try This 1
 

If 10 000 mufflers are produced, how many will last at least 9.25 years? Use the interactive applet Lifetime of a Millennium Muffler to determine what percentage of Millennium Mufflers should last at least 9.25 years.

 

 

This is a screenshot for Lifetime of a Millennium Muffler.

muffler: iStockphoto/Thinkstock



Self-Check 3
 

Complete “Practising” question 7 on page 292 of your textbook. Answer