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If sum(i=1)^5xi^2=40&sum(j=6)^(10)xj^2=...

If `sum_(i=1)^5x_i^2=40&sum_(j=6)^(10)x_j^2=20` and mean of `x_1,x_2, ...,x_5` is 1 and mean of `x_6,x_7, ...,x_(10)` is 2 then variance of `x_1,x_2 ,...x_(10)` is

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