Math Question: Let X be a continuous random number with (cumulative) distribution function F (x) =(0 x < 5) (1-(25/x^2 x>5) The expected value E(X) is: a)6 b)8 c)4 d)10 e) 12 The answer is displayed as 10, however, I find that the integral of xf(x) (and f(x)) diverges, and furthermore the function doesn't satisfy the normalization condition. What am I missing? Is there a different formula for this type of problem? Thank you so much

Asked By Alessandra On 08/18/2019 21:15