Two classes can share a mean of 60, but one has scores 55-65 and the other 20-100. Range is the crudest way to see this; standard deviation (Class 11) sharpens it.
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Class 9 · Ganita Manjari · Unit 10: How Quantities Combine: Understanding Data
Spread — Why Two Classes with the Same Mean Feel Very Different
Lesson 3 of 3