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When does a data set have no mode at all?

AEach value occurs oddly
BEach value occurs early
CEach value occurs once
DEach value occurs often
Answer & Solution
Correct answer: C. Each value occurs once
1. The mode is the most frequent value. 2. If nothing repeats, nothing is most frequent. 3. A data set has no mode if each value occurs only once. 4. So the answer is when each value occurs once. _Source: syllabus Computer Science, Ch 7 'Understanding Data'_
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