My goal is to get x value where area under the curve (from the x ~ infinity) is about 0.05. But the code which I have tried shows errors. How to correct it?
Solve(!( *SubsuperscriptBox(((Integral)), (x), ((Infinity)))( *FractionBox(( *SuperscriptBox((E), ((-x)/2)) *SuperscriptBox((x), (3/2))), (3 *SqrtBox((2 (Pi))))) (DifferentialD)x)) == 0.05, x)