I am a newbie here and apologize if this post is in the wrong forum.

I need help to solve the following LogNormal Conditional expectation equation for MuNew such that:

(e^(MuNew + Sigma^2/2)*normcdf((-log(LowerLimit)+MuNew+Sigma^2)/Sigma))

/

(1-logncdf(LowerLimit, MuNew, Sigma)) - Severity = 0.0001

normcdf = Standard Normal cumulative distribution function. Hence Mu = 0, Sigma =1

logncdf= Lognormal cumulative distribution function

Is there any pros out there that can help me?

Thanks!!

Br, Magnus