SOF International Mathematics Olympiad (IMO)
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IMO Level 1
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2026
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Sample
Find the mode of the data set: 18, 5, 6, 3, 18, 18, 10
Explanation
Explanation
The mode is the value that occurs most frequently in the data set. Here 18 appears 3 times while every other value appears only once, so the mode is 18.
PRO TIP
Re-check your working by substituting the answer back into the original question.