Therefore, the maximum number of wins expected for 1000 people with odds of 1 to 20 is 50. So, first of all, 1 to 20  odds is actually equivalent to 1 in 21 people winning, not 1 in 20 people winning.

When you see the odds presented as 30:1 or 3:1 that's actually just showing the payout for a winning bet, not the likelihood of that team winning. 30:1 doesn't mean that the team is 30x more likely to win, it means that if you bet on that team and they win you will receive $30 for every dollar you bet.

Cash Out is a feature that gives you the opportunity to close out your active bet before the outcome is decided. This allows you to secure part of your winnings or cut your losses as the odds change in or against your favor.

Cashing out can be tempting because it lets you lock in a profit or mitigate your losses. Unfortunately cashing out your bet also has a negative ROI over the long run. Sportsbooks understand their customers can get trigger happy, so they make sure those early cash outs are much lower than they should be.