Refer to the following distribution of ages: 
What is the class midpoint of the highest class?
Definitions:
Interest Rate
The percentage of a sum of money charged for its use, often expressed annually.
Stated Rate
The interest rate declared on a bond or other loan by the issuer, also known as the nominal or coupon rate.
Money
A medium of exchange that facilitates trade and is used as a measure of value and a store of wealth.
Accounts Receivable
Money owed to a business by its customers for goods or services delivered but not yet paid for.
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