标准差和方差计算

1132564758453221561787657743535645343425238612653456568923566743342745222312532345

12

67

49

87

需求量标准差24.1183424922.6482828.6356421313.8333322.08381需求量方差

581.6944444512.9444

820

191.3611487.6944

提前期（L）行

需求量（D）列

提前期标准差提前期方差19.56271965382.7

16.33095221266.7

17.72004515314 11.94571053142.7 30.70016287942.5 23.33452378544.5 15.139********.2 15.46932448239.3 27.87471973777