f********r
发帖数: 121 | 1 if x~N(mu, sigma), what's the expectation of 1/x, 1/x^2?
E(1/x)<1/mu?
E(1/x^2) >1/(mu^2+sigma)?
how to get the exactly value?
thanks a lot | m****u
发帖数: 29 | 2 老大，积分会不会？
不会手算，mathematica 会不会
【在 f********r 的大作中提到】
: if x~N(mu, sigma), what's the expectation of 1/x, 1/x^2?
: E(1/x)<1/mu?
: E(1/x^2) >1/(mu^2+sigma)?
: how to get the exactly value?
: thanks a lot
|
|
