Re: Sample Questions of ISI ME I (Mathematics) 2010 Discussion

Posted by N Uday Kumar on Apr 07, 2010; 4:06pm
URL: http://discussion-forum.276.s1.nabble.com/Sample-Questions-of-ISI-ME-I-Mathematics-2010-Discussion-tp4850019p4865781.html

Then Expectation of X is
Ans. (b) " ∞ "

E(x) = (-∞)INTEGRATION(+∞)[x*f(x)] = (-∞)INT(c)[x*f(x)] + (c)INT(+∞)[x*f(x)] =
= (-∞)INT(c)[x*0] +(-∞)INT(c)[x*(c/sq(x))] = (c)INT(+∞)[c/x] = c*[log(∞)-log(c)] = '∞'