Y1=2X1-X2+X3~N(0,36)
Y1/6~N(0,1)
Y2=X4+2X5-3X~N(0,84)
Y2/根号84~(0,1)
Y=Y1^2+Y2^2=(2X1-X2+X3)^2/36+(X4+2X5-3X6)^2/84~X^2(2)
a=1/36
b=1/84
n=2
Y1=2X1-X2+X3~N(0,36)
Y1/6~N(0,1)
Y2=X4+2X5-3X~N(0,84)
Y2/根号84~(0,1)
Y=Y1^2+Y2^2=(2X1-X2+X3)^2/36+(X4+2X5-3X6)^2/84~X^2(2)
a=1/36
b=1/84
n=2