Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Statistics Difficult · 45s
Find the population standard deviation for values 2,4,6,8 with frequencies 3,5,7,5.
TopicStatistics
Question Typemultiple choice
DifficultyDifficult
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
x̄=5.40; σ=√(Σf(x−x̄)²/Σf)=2.010.
Final Answer: Option C — 2.010