The first four customers of the day at a small coffee shop spent the following amounts. Quiz 2 Data Set 1: $5, $2, $4, and $10. The owner suggests based on the usual number of customers that the average sale must be at least $3 for the shop to make a profit. Help the manager by answering the following questions about this sample (the data set only has four observations so you can practice using the formulas to solve by hand): What is the standard deviation