问题
今天被问了一个问题:
μ = ∫ ∫ ∫ ∫ ∫ ∫ f ( x 1 , x 2 , x 3 , x 4 , x 5 , x 6 ) d x 1 d x 2 d x 3 d x 4 d x 5 d x 6 σ 2 = ∫ ∫ ∫ ∫ ∫ ∫ [ f ( x 1 , x 2 , x 3 , x 4 , x 5 , x 6 ) − μ ] 2 d x 1 d x 2 d x 3 d x 4 d x 5 d x 6 \begin{array}{l} \mu = \int\int\int\int\int\int f(x_1, x_2, x_3, x_4, x_5,x_6)dx_1dx_2dx_3dx_4dx_5dx_6 \\ \sigma^2 = \int\int\int\int\int\int \left[ f(x_1, x_2, x_3, x_4, x_5,x_6)-\mu\right]^2dx_1dx_2dx_3dx_4dx_5dx_6 \end{array} μ=∫∫∫∫∫∫f(x1,x2,x3,x4,x5,x6)dx1dx2dx3dx