And then the total variation from the mean, squared distances from the mean of the y, are 22.75.
然后与均值的总变异，与 y 均值的平方距离为 22. 75。
可汗学院：统计学（视频版）
Find the square distance from each of these points to your sample mean, add them up, divide by n minus 1, because it's a sample, then take the square root, and you get your sample standard deviation.
求出这些点中的每一个与样本均值的平方距离，将它们相加， 除以 n 减 1， 因为它是一个样本，然后取平方根， 就得到了样本标准差。