A major department store chain had planned to reach a sales goal of 50 refrigerators per store at a recent end-of-season sale. The actual number of refrigerators sold during this sale at a sample of ten sotres was:
80, 110, 0, 40, 70, 80, 100, 50, 80, 30
Is there any evidence that the average of the refrigerators sold per store was significantly more or less than 50 (Find the mean first and make sure that you formally state the null and alternate hypotheses)