Your number seems fair...
In all honesty I have no idea either...I hear alot that twice as many apps are typically received in the 2nd rd, vs. the 1st...but tuck really has 4 rounds...so it's tougher to guess the distribution, apply the yield, and back into an estimate of acceptances...
I would expect EA to have a greater yield than other rounds...maybe 70-80%?...so assuming that...I think an estimate of 100-130 EA offers seems reasonable...
(This is me licking my finger, and holding it up in the wind...)