Slot machines have targeted payback percentages built into their programming, but results are random. Programmed percentages on the slots work in the same way as percentages on the tables – the odds of the game lead to expected returns. ... Odds are set so big winners turn up less often than other combinations.

How are slot machines programmed to pay out?

Slot machines are typically programmed to pay out as winnings 0% to 99% of the money that is wagered by players. This is known as the "theoretical payout percentage" or RTP, "return to player". ... In this (simplified) example, the slot machine is said to pay out 95%.

How is a slot machine programmed?

Easily, as it turns out: the slot machines' algorithm is programmed to work randomly. That means, it's programmed to show 'a' set of symbols across 'some' paylines – with nothing predetermined, and these symbols and paylines displaying randomly.