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:
Pigouvian Subsidy
A payment designed to encourage activities that yield external benefits.
Scenic Beauty
The visual appeal and aesthetic value of a particular landscape or location, often contributing to its desirability for recreation and tourism.
Bat House
A man-made structure designed to provide roosting sites for bats, facilitating natural pest control and biodiversity.
Policy Solution
A strategy or plan of action designed to address a particular public issue or problem.
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