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The standard deviation of n observations...

The standard deviation of n observations`x_(1), x_(2), x_(3),…x_(n)` is 2. If `sum_(i=1)^(n) x_(i)^(2) = 100` and `sum_(i=1)^(n) x_(i)^(2) = 20` show the values of n are 5 or 20

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