00:01
Now we're looking at drawing two marbles from a bag, and we're drawing them with replacement.
00:08
Okay, with replacement means that the drawers are independent.
00:15
If it were without replacement, they wouldn't be.
00:17
So what's the probability, first of all, of getting yellow, then yellow.
00:22
So the first one is yellow, the second is yellow.
00:26
So for the first marble, what's the chance for it being yellow? well, there's 12 in the bag, so i'm going to have a fraction with all the marbles as the denominator, and the ones meet our criteria as the numerator, because each marble has a 1 in 12 chance of being chosen, and there's 3 to yellow.
00:45
So, 1 in 4.
00:48
What's about the seconds? sure.
00:51
Well, we put the marble back, so there's still 12 marbles in the bag, and still, they're over them a yellow...