A study found the following parts per billion of nitrosamines in a sample of domestic beers.(a)Construct a frequency distribution of four classes with equal class sizes.(b)Construct another frequency distribution of four classes using unequal class intervals or an open-ended interval for the highest class.(c)Which frequency distribution is preferable? Why? 
Definitions:
Return on Investment
Return on Investment, or ROI, measures the gain or loss generated on an investment relative to the amount of money invested.
Invested Assets
Financial assets purchased with the expectation that they will generate income or profit, or appreciate in value.
Operating Income
Earnings before interest and taxes (EBIT) is a company's profit from normal operations, excluding non-operating income and expenses.
Return on Investment
A financial metric used to evaluate the efficiency of an investment, calculated as the net gain or loss on the investment relative to the cost of the investment.
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