The table below gives the normal daily mean temperatures, based on a 30-year period 1961 through 1990, for a certain city. Use the data to estimate the amplitude to the nearest degree. 
Definitions:
Fixed Expenses
Costs that do not change in total with variations in the volume of activity, such as rent, salaries, and insurance.
Selling Price
The price at which a product or service is offered to consumers.
Net Operating Income
The revenue from a company's primary business operations minus operating expenses, excluding taxes and interest.
Units Sold
The quantity of product units that have been sold during a specific period.
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