TABLE 2-5
The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?
Definitions:
Income Taxes
Taxes levied by a government directly on income, both earned (salaries, wages) and unearned (dividends, interest).
Inventory Turnover
A ratio showing how many times a company's inventory is sold and replaced over a certain period of time, indicating the efficiency of inventory management.
Cost Of Goods Sold
The immediate expenses related to manufacturing products sold by a business, which encompass both materials and labor.
Merchandise Inventory
The total value of a company's products that are physically held in stock, awaiting sale to customers.
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