Solved UPSC CDS/OTA Question
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Q · Statistics Moderate · 45s
Using assumed mean A=205, compute the mean for values 198,202,205,210,215 with frequencies 4,7,9,6,4.
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 = A + Σ(fd)/Σf = 205 + 21/30 = 205.70.
Final Answer: Option D — 205.70