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
For x:10,20,30,40,50 with frequencies 3,6,_,5,2, the median is 30. Find the missing frequency.
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.
Let's miss it at 30. With N=16+m, I need cum. before 30 < (N+1)/2 ≤ cum. at 30 ⇒ m=2 works.
Final Answer: Option A — 2