Math miscellaneousEasy

Question

If variance of the group ∝, 1 + ∝, ......, n + ∝ is , then value of n will be :-

Options

A.21
B.20
C.19
D.none of these

Solution

α, 1 + α, 2 + α,........(n + α)
0, 1, 2,....................n
1,2,3....................(nH)
variance =

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