[問題] F( U < u)
f(y1,y2,y3,....,yn)=ΠExp[-yi/b]/b = b^(-n)*Exp[(-Σyi)/b]
note that f is normailized (integration over the whole space of degree n)
What's the value of f(y1+y2+y3+...+yn < U) in terms of b, given U?
this is troublesome by direct integration, is there any other
way to do it? thx
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