Question

obtain the joint characteristics function f(x,y) = exp (-(x+y))

Answer 1

2

However, the situation here is similar to that in (6-13), and

it is possible to express the mean of in terms

of without computing To see this, recall from

(5-26) and (7-10) that

where is the region in xy plane satisfying the above

inequality. From (10-3), we get

As covers the entire

z axis, the corresponding regions

are nonoverlapping, and they cover the entire xy plane.

() ( )

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