Sales were 12, 18, 15 and 21 units on four days. What is the mean daily sales?
Answer and explanation
Correct answer: D. 16.5 units
- Step 1: Total = 12 + 18 + 15 + 21 = 66. Step 2. Mean = 66 / 4 = 16.5. Answer: 16.5 units. Why not the others: 15 is not the middle of the sorted list (that is 16.5), and the other options do not use the correct total of 66.
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