Considering U1 and U2 which both follow Uniform (0 , A), then after(adsbygoogle = window.adsbygoogle || []).push({});

the transformation of variable, i can find x=(U1+U2)/2 has f(x)=2/A(both

my classmates and me get this result). However i am confused that when i

integrate x by it range from 0 to A (because U1 and U2 both ranged from

0 to A), the prob equals 2 instead of 1. What's wrong with my mind?

steps : http://desmond.imageshack.us/Himg848/scaled.php?server=848&filename=steps.png&res=landing [Broken]

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# Confusing in transforming variable

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