Use the 68-95-99.7 Rule to Solve the Problem

question 79

Multiple Choice

Use the 68-95-99.7 rule to solve the problem.
-The amount of Jen's monthly phone bill is normally distributed with a mean of $70 and a standard deviation of $9. What percentage of her phone bills are between $43 and $97?

• A)68%
• B)95%
• C)99.9%
• D)99.7%

---

Definitions:

Bankruptcy

A legal procedure for dealing with debt problems of individuals and businesses; officially declaring the inability to pay outstanding debts.

Appliance Manufacturer

A company involved in designing, producing, and selling electrical or mechanical devices for domestic use.

Mutual Fund

An investment program funded by shareholders that trades in diversified holdings and is professionally managed.

Mortgage

A loan used to purchase a property, where the property itself serves as collateral until the loan is paid off.