The OP really needs to learn some basic poker odds. If he hasn't learned this in "20 years" he/she should not get upset by a hand like this, or quit poker... OP, It's not hard. You can search 'poker hand calculator' in your browser and you'll get dozens of calculators you can plug in all the exact hands into for however many players were in the hand, and it will tell you the odds of each individual one on every street until showdown
It's an average number based of off a VERY LARGE number of spins. They have this irl too. The minimum percentage is set by law in most places. Like in the US live slots are 85%