Slot machines generate 65-70% of an average casino’s income.
In Las Vegas slot machines average a payback to players of roughly 95%.
Random Number Generator:
Slot machines are programmed with numbers that are assigned to each symbol on the reels.
The Random Number Generator is making about 1000 mathematical calculations a second. When you press the spin button, you stop the RNG and it spits out a number that will either correspond to a winning combination or a losing one.
This makes a slot machine completely random.
A machine is never due to hit as the RNG has no memory and each calculation is completely independent of the last.
This means that a machine could hit a jackpot, consecutive times in a row or not hit for weeks, months or even years.