Statistics Question 1 – UPSC CDS/OTA

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 Easy · 45s

Find the arithmetic mean of the data: 12, 15, 18, 20, 25, 30.

TopicStatistics

Question Typemultiple choice

DifficultyEasy

Marking+1 / −0.33

Test Duration30 min

Step-by-Step Solution

Every step explained — no skipped algebra.

Mean = Σx/n = 120/6 = 20.00.

Final Answer: Option D — 20.00