00:01
Hi, i'm david and i'm here to have you answer your question.
00:04
Now let me bring up your question here.
00:08
In this question we have a box contains five red and five blue marbles.
00:13
So let me try to summarize the question here in the box here.
00:18
Totally we have 10 marbles and then inside we have the five red and then the five blue.
00:31
And then we want to draw two randomly.
00:37
And then we will call the x it will be the gain.
00:42
So we will have the x equal to the 1 .1.
00:49
If we have the red red or we will have the blue blue and then we will have x equal to the minus 1.
01:04
If we will have the red blue or we will have the blue, red and then now we want to find the expected value of the win and also the variance on the win.
01:26
Now here x it will have two values only either equal to the 1 .1 or we get equal to the minus 1.
01:35
Now to get the probability correspond to the volume the x for the 1 .1 we will require that we have both red red, red, or we should have the blue blue.
01:50
Now we want to find the probability of the red first.
02:03
Then the total maples we have the 10.
02:07
We want to control two of them.
02:09
So the total number of the weights will be the 10 we choose two.
02:13
Now from the group of the five red we will choose two of them...