Variance when we add a new point in the data set

Asked Oct 06 '22 at 13:33

Active Oct 06 '22 at 14:10

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variance of 10 data set is 20, and mean is 3. If we add new observation 3 (say). Then total observations are 11. Can we find variance for these 11 observations?

What I did so far... sum of x_i = 10*3 = 30 sum of [${x_i}^2$ divided by 10] - 9 = 20 or ${x_i}^2$ = 290

now, a new observation added. now n = 11. What is the new variance

edited Oct 06 '22 at 14:10

asked Oct 06 '22 at 13:33

ER 4profit

Updating standard deviation without set – user2974951 Oct 06 '22 at 13:37
Computation of new standard deviation using old standard deviation after change in dataset – user2974951 Oct 06 '22 at 13:37

Variance when we add a new point in the data set

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