怎样计算出 standard deviation ?

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stadard deviation=positive square root of the following number x x =( 6x(58-49.72)^2+7x(55-49.72)^2+11x(52-49.72)^2+9x(49-49.72)^2+7x(46-49.72)^2+ 6x(43-49.72)^2+4x(40-49.72)^2)/50 standard deviation=5.3180(corr. to 4 d.p.)
参考: Mathematics In Action 5B