defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Statistics Variance and Standard Deviation
In an experiment with 15 observations on x, the following results were available \(\sum {{x^2}} \) = 2830, \(\sum x \) = 170. On observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is
1
78.00
2
188.66
3
177.33
4
8.33