My memory is bad... it's not THAT bad.
Take a guess. Last 24 superbowls. What was the percentage of times the house won? 50% might be the obvious answer but obviously they get the push... so..... take a guess.
I don't understand your question. The goal is equal money on both sides so the house gets the 10% on the total action. The house tries to guess the exact score. Are you asking how many times they got the spread exactly correct?