random variable

Posted by tanudas on Apr 20, 2015; 3:57pm
URL: http://discussion-forum.276.s1.nabble.com/random-variable-tp7596259.html

The probability density of a random variable is
f(x)=ax^2e^(−kx) ; k>0,0≤x≤∞
What is the value of a?

I understand that first we'll have to take the integral of the function with limits 0 and ∞ and then substitute them in the integral obtained. This is where I'm stuck because substituting 0 and ∞ yields an undefined number. I need to know where I'm going wrong and how to proceed with it. Thank you !