A statistics professor has just given a final examination in his linear models course. He is particularly interested in determining whether the distribution of 50 exam scores is normally distributed. The data are shown in the table below. Perform the Lilliefors test. Report and interpret the results of the test. 
Definitions:
Fixed Cost
Costs that do not vary with the level of production or sales, remaining constant within a specific range of activity.
Contribution Margin
The difference between a company's sales revenue and its variable costs.
Traceable Fixed Expenses
Fixed costs that can be directly linked to a specific business segment or operation.
Net Operating Income
A company's income after all operating expenses are deducted but before interest and taxes are accounted for.
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