Problem-Solving and Data Analysis practice question

Answer: A. 21

The range is the largest value minus the smallest: 30 − 9 = 21.

Why the other answers are wrong

B. 18.8

18.8 is the MEAN, 94 / 5. The range measures spread, from smallest to largest.

C. 18

18 is the median, the middle value when sorted (9, 15, 18, 22, 30).

D. 30

30 is the largest value alone. The range subtracts the smallest from it.

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