Hi Guy's,
In the Exponential Density distribution

cxe^(-x^2/2)

I have been asked to find the Expected value of x and determine the value of c


I think that the Expected value is 2.

But I'm not sure how to calculate the value of c.

If I take the rate parameter (lambda) of this part of the function (-x^2/2) to = 1/2, Do I need c to be a value that makes sure that cx is always = 1/2?

regards
Brendan