Looking at SP+, Illinois' win probably against Wisconsin this week is 85%. Next week vs Northwestern isn't calculated yet (because he factors the current week into it), but last week against Maryland they were 80%, and I would have Maryland comparable to NW.This is just a back-of-the-envelope calculation—please don't buy stocks based on this! Assuming the two games are independent, we can calculate the probability of winning both by multiplying their individual probabilities.
If the win rate (yes, that's my assumption) for each is 63% (0.63):
0.63×0.63=0.3969 (approx 0.40)
Therefore, the probability of winning both games is 40%.
So, 85% and 80% = approximately 65%, which feels about right.