There have been steady increases in payout percentages since casinos realized it was more profitable to hold 5 per cent of a dollar than it was to hold 8 per cent of a quarter or 10% of a nickel. Almost all slot machines in America payout 93% of the time, although Nevada pays out more. Of all the casinos, Las Vegas typically offers the highest average payout of more than 95%. Considering a sample of 100,000 to 300,000 pulls, these are long-term averages that can be relied upon.
Anything can happen in the short term. The payout rate on video slots is higher than on reel-spinning slots, but it is still normal to go 20 or 50 pulls without a payout. In addition, it is not unusual for a machine to pay back 150% or more for several dozen pulls. However, the programmed percentages will hold up in the long run.
Microprocessors have been responsible for the change in slots in the new era of computers. In the old days, slot machines were mechanical, and if you knew how many stops each reel could make on the payout line, you could calculate the odds. On a machine with three reels and ten stops and a jackpot symbol on each reel, three jackpot symbols would line up, on average, once every 1031310 pulls, or 1,000 pulls.
The big payouts were usually $50 or $100-a a far cry from the high numbers that slot players are used to today. Several casinos have linked machines that link progressive jackpots up to millions of dollars.
Today's machines are controlled by microprocessors programmed with random-number generators that determine winning combinations. It does not matter how many stops are on each reel. The slot machine is still programmed to line up three jackpots once every 1000 spins, or 10,000 spins. Video slots can also be programmed so that their reel strips are as long as needed to increase their odds of hitting. There is no physical reel to constrain them.
Random Number Generator ( RNG )
There are a number or numbers assigned to each possible combination. Whenever the random-number generator receives a signal, such as a coin being dropped in or a handle is pulled, it sets a number, and the reels stop at the corresponding combination.