If the mean of a dataset is 15 and the sum of squared deviations from the mean is 90 for 10 observations, the variance is: MCQ with Answer and Explanation
If the mean of a dataset is 15 and the sum of squared deviations from the mean is 90 for 10 observations, the variance is:
A. 8.1
B. 10
C. 9
D. 90
Answer: Option C
Solution (By JKSSB Mock Tests)
Population variance = 90/10 = 9. Sample variance = 90/9 = 10, but usually variance of the data (population) is 9 if it's the whole set. I'll assume population.
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