某中班6名幼儿的身高分别为120,115,107,119,107,104(单位:厘米)请列出公式并计算它们的平均数和标准差。
(1)算术平均数:X(上面有横线)=(X1+X2+X3+…Xn)/N=(120+115+107+119+107+104)/6=112。(2)标准差S=√[∑(X-X(上面有横线))2/N]≈6.27。
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