\sqrt{\frac{(4\times450.5^2+8\times510.5^2+6\times630.5^2+12\times570.5^2)-(30\times 550.5^2)}{29}}\sqrt{\frac{(4\times450.5^2+8\times510.5^2+6\times630.5^2+12\times570.5^2)-(30\times 550.5^2)}{29}}

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