What does “Measures of spread” actually mean in Sets & Statistics, and why does it matter for JEE?
standard deviation measures how far the data typically lie from the mean — small means tightly clustered, large means spread out.
In simple words: standard deviation measures how far the data typically lie from the mean — small means tightly clustered, large means spread out. Getting Measures of spread clear matters because JEE questions on Sets & Statistics usually test this idea directly, not just a formula you memorised.
Key point
Measures of spread
Common mistake
thinking two data sets with the same mean must be alike.
Memory tip
same mean, different spread — the standard deviation tells them apart.
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