If both the mean and the standard deviat...

If both the mean and the standard deviation of 50 observations `x_(1), x_(2),…, x_(50)` are equal to 16, then the mean of `(x_(1) -4)^(2), (x_(2) -4)^(2), …., (x_(50) - 4)^(2)` is k. The value of `(k)/(80)` is _______.

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