In order to protect the integrity of a casino, security measures are put in place on the casino floor. These security measures include surveillance cameras that monitor every window and table. These cameras are adjusted to focus on a suspicious patron, and video feeds are recorded for later review. Casinos also have computer chips installed inside the machines, which determine the payouts. In addition, no one is allowed to watch the slot floor; security personnel can spot blatant cheating.
The house edge is the difference between the true odds and the payouts made by the casino. This advantage is different for each game and is measured as a percentage. The higher the percentage, the more money the casino wins. For example, if the house edge is 50%, the casino is more likely to make a profit than a player.
In order to create profitable games, casinos need to calculate the house edge and variance, which tell them how much to win and how much to lose. These calculations are done by computer programmers and mathematicians. Many casinos do not have the in-house expertise to perform these calculations, so they outsource this work to experts.
The casino edge can be as low as two percent. With millions of bets, the casino can earn millions of dollars and keep its edge low. While this is not an exact science, it does help casino owners make money.