00:01
This question is about finding expected value here.
00:04
So what we need here, there's a standard deck of cards in the sample space here, 42, i mean 52, and the number of king card, so there are four kings.
00:15
So what we need here, so the probability of getting a king, this is 4 over 52, which is 1 over 13, and the probability of not king, which is equal to 1 minus 1 over 13, that should be 12 over 13 here.
00:34
And we're going to find the expected value.
00:36
Let's remember the formula.
00:37
Expected value is the sum of the xi times the probability of this case.
00:43
So in this case, if the card is king, you will just win $20...