The following data reflect the number of customers who return merchandise for a refund on Monday. Note these data reflect the population of all 10 Mondays for which data are available. 
Based on these data, what is the standard deviation?
Definitions:
Variable Costs
Expenses that change in proportion to the activity of a business, such as materials or labor directly tied to production volume.
Break-even Sales
The point at which total sales equal total expenses, resulting in no profit or loss.
Fixed Costs
Expenses that do not change with the level of goods or services produced by a business, such as rent, salaries, and insurance.
Variable Costs
Expenses that change in proportion to the activity of a business, such as materials and labor costs that vary with production volume.
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