Problem-Solving and Data Analysis practice question

Answer: A. 9

The mean is the sum divided by the count: (4 + 8 + 9 + 15) / 4 = 36 / 4 = 9.

Why the other answers are wrong

B. 8.5

8.5 is the MEDIAN — the average of the two middle values, 8 and 9. The mean uses all four values.

C. 36

36 is the sum of the values. Divide by how many there are, 4, to get the mean.

D. 11

11 is the range, 15 − 4. The mean is the total shared out equally, 36 / 4.

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