A company collected the ages from a random sample of its middle managers,with the resulting frequency distribution shown below. 
What is the midpoint of the third class interval?
Definitions:
Effective Interest Method
An accounting practice used to allocate loan or bond interest expense over the life of the loan or bond based on the loan's amortized cost.
Interest Payment
The amount paid by a borrower to a lender as compensation for the use of borrowed money, usually expressed as a percentage of the principal amount.
Premium on Bonds Payable
The amount by which the bond's selling price exceeds its face value, representing an additional cost to the issuer.
Par Value
The face value of a bond or stock as stated in the corporate charter, not necessarily related to its market value.
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