Lesson 4
1. Lesson 4
1.5. Explore 4
Module 4: Statistical Reasoning
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.
muffler: iStockphoto/Thinkstock
Self-Check 3
Complete “Practising” question 7 on page 292 of your textbook. Answer