Erlang C (m, u,), solve for m

[uneakbreed]

Hi, I'm trying to re-write the Erlang C formula. The formula E=(m, u) where m = number of staff and u = lamda/average call duration, and p = u/m.


i have the formula written as
poission(m,u, false)/(Poisson(m,u,false) + (1-p) x Poisson(m-1,u,true))

how would i rewrite this formula to solve for # of staff needed, if i plugged in the probability of wait along with all the other variables??

[martindwilson]

deleted.....

[martindwilson]

you might want to read here
http://www.lokad.com/calculate-call-...ith-excel.ashx
and here
http://www.erlang.co.uk/excel.htm