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I can't ... this is too much XD
Technically not how it works. See if you only do something one time you only have 20% chance of it EVER happening in your life time. However if you attempt the same thing multiple times throughout your life you'd have to calculate the cumulative effects of the probability happening throughout your life it wouldn't be a flat %.
However the user is unlikely to understand the statistical chance of 20%.
This is how lotto winning companies work back in the day they would calculate the amount of tickets needed to win by 100% this was before lotto companies figured this out. So if you needed $1,000,000 of tickets to win a $12,000,000 prize pool the group of people would pool their money to buy those tickets and then profit the $12,000,000 and split it.
Which since there are so few people who grasp math made this method of profit easy for the few that do know math.
If something has a 20 percent chance to occur in any one trial, how many trials should one EXPECT to conduct for this event to occur?
. . .the absolute abuse of probability in defense of (admittedly unverified) empirical results is something else.
21.
It's not a 100% chances at 21 it's just a HIGH probability of a drop by that amount of runs.
Bro , these people aren't real. The education system has failed us.
Pretty sure Khan Academy videos are still up on YouTube.
with 21 trials you only have a 99.08%
some times you are just in the the other 0,92%
(that is (4/5) ^21 )