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Friday, 9 October

JEE Main Maths · Statistics

Calculating Sum of Squares from Variance

Calculating Sum of Squares from Variance (Statistics) was asked once in the 42 JEE Main shifts Lumi analysed, in 2026.

Times asked
1
in 1 shift
Years
2026
Usual format
Single correct
Calculation
Pattern
New since 2024
asked once so far

How it is asked

  • Find standard deviation from sums of squares

Difficulty

Easy 0Medium 1Hard 0

Where it sits

Chapter: Statistics. Topic: Variance and SD, 27 questions over 10 ideas.

Other repeat ideas in this topic

Every time it came

The question

Newest first, each with its options and official answer.

  1. 4 Apr 2026, Shift 2 · Q8For 10 observations x1,x2,…,x10x_1,x_2,\ldots,x_{10}, if ∑i=110(xi+2)2=180\sum_{i=1}^{10}(x_i+2)^2=180 and ∑i=110(xi−1)2=90\sum_{i=1}^{10}(x_i-1)^2=90, then their standard…MediumSingle correct