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UP TGT Mathematics Statistics Test Series - Part 7

If the sum of squares of deviations from an assumed mean 25 for 10 items is 250, and Sum(x - 25) = 10, the exact SD is:

Type: MCQ • Marks: 1
If the sum of squares of deviations from an assumed mean 25 for 10 items is 250, and Sum(x - 25) = 10, the exact SD is:
Options
A. 7.00
B. 5.00
C. 24.00
D. 4.89
Explanation
Var = [Sum(d^2)/N] - [Sum(d)/N]^2 = (250/10) - (10/10)^2 = 25 - 1 = 24. SD = sqrt(24) approx 4.89.
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