the house calculate the people to buy different results
example one game , supposed to have 100 people join in game, and 90 to pick results A, 10 to pick up results not A
so in general, house will give
odds like
results A: 1 to win 1.1
results not A: 1 to win 1.9
then collect money, but house will take some rake
so the final bet odds will something like 1 to 1.05 other side will be 1 to 1.85
so that regardless the results, the house will win.
sportsbetting odds does not mean anything to game results just related to the percentage , player buying the possible results.