[ezinestein]

Hi,

I hate sounding so stupid... but I really want to know how to figure this stuff out.

I’m trying to figure out how to figure out the Standard Deviation when playing blackjack. Can anyone please tell me if this is the right way to do it?

Example:

1. Playing a game where the house has a 0.5% advantage.
2. 400 hands at $5 per hand for a total of $2000 wagered.

1.1 / 20 (20 being the square root of 400) = 0.055
0.055 * 400 hands = 22 units
22 * $5 bets = $110
So... $110 equals one standard deviation... right?

So with the -0.5% EV of $10... would your numbers for 1 standard deviation be... -$120 to +$100?

So if you started with a $200 bank roll you could end up with anywhere between $80 and $300? Is that right?

And 2 standard deviations would be ‘bust’ on the low end or $410 on the high end right?

Thank you for any help with figuring this stuff out.

Kindly,
Ezinestein

PS – Also... can anyone direct me to something that shows me how to easily figure out risk of ruin... and how to figure out what size bank roll a person needs depending on bet size?