Spoiler
\sqrt{\dfrac{\sum(x_i - 50.487\dot{2})^2}{35}} = 5.6 [br]\dfrac{\sum(x_i - 50.487\dot{2})^2}{35} = 5.6^2 [br]\dfrac{\sum(x_i - 50.487\dot{2})^2}{35} = 31.36 [br]\sum(x_i - 50.487\dot{2})^2} = 31.36 x 35[br]\sum(x_i - 50.487\dot{2})^2} = 1097.6[br][br]\sqrt{\dfrac{1097.6}{36}}
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