So here's the thing about quantum mechanics, it averages out as you get bigger. Take a fair die. Roll it, and you'll get something between 1 and 6. Each value just as likely as any other. Random. Roll 2d6, and you'll get anything between 2 and 12. But 7 will be the most likely roll. 1+6, 3+4, and 6+1 all equal 7, but only 1+1 equal 2. This is probabilistic. Roll two dice and it'll come up near 7, most probably. And it probably won't be 2. It's possible, just not probable. Roll 100 dice and you'll likely get a number around 350, plus or minus a few. 80% of the time you'll have a value between X and Y. Roll 1,000,000 dice and you'll get around 3,500,000, plus or minus a few thousand, 80% of the time you'll have a value between X and Y. Notice that those values are getting narrower? The more dice you roll, the less standard deviation you'll get. At least proportionally. If you were to roll an infinite amount of dice, and average it out, you'd get 3 and a half, exactly. Yes that's how infinity works, it's kooky.
The position/momentum of an electron is random, but as time goes on it averages out so you can guess it's overall behaviour. If you get enough of them over enough time and you can bet money on I=V/R.
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