Question 820924
A roulette wheel has 18 red, 18 black, and 2 green slots. one dollar bet on black wins one dollar. find the expected value for a $10 bet on black. 
<pre>
18 successful slots out out of 38, a probability of winning is {{{18/38}}} = {{{9/19}}}

Expected value for the player = (Amount won)(Probability of winning) = $10{{{(9/19)}}} = $4.74

Therefore the expected value for the casino is $10.00-$4.74 = $5.26 

if 1000 people each make a $10 bet on black, how much does the casino expect to make?

$5.26×1000 = $5260

Edwin</pre>