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 Moderate · 45s
Find the population variance of 5, 7, 9, 11.
TopicStatistics
Question Typemultiple choice
DifficultyModerate
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
x̄=8.00; variance σ²=Σ(x−x̄)²/n=5.00.
Final Answer: Option D — 5.00