I think your calculations are off. The correct values are here:
Oops, I messed up. The numbers I gave are not expected return but instead the odds ratio.
For Hi / Low the odds are 105:111, for an expected value of 0.972, for middle the odds are 102:114 for an EV of 0.944. You are right about those.
But Sir_Bolo's calculation of 83.3% for Outside is incorrect. Remember that when you win, you win back the chip you bet as well as the 5:1 payout, so the value I gave in my last post is actually correct.
