medium · GMAT Quant
A set contains the seven numbers 7, 9, 12, 15, 18, 22, x, where x is an unknown real number.
For which of the following must the median of the set equal 15?
- x ≤ 15
- 12 < x < 18
- x ≥ 15
- x = 15 only
- x > 18
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