00:05
Okay, the probability that a salesperson makes a sale is 0 .21.
00:12
So if the salesperson talks to the next four customers, what's the probability that they make a sale for each of those four customers? so in other words, what's the probability that they make a sale with the first customer and a sale with the second customer and a sale with the third customer and a sale with the fourth customer? well, that's simply going to equal.
00:41
Okay? when you're looking for these compound probabilities, we have to multiply the individual probabilities.
00:46
So the probability that we make a sale with each of the four customers is the probability that we make a sale with the first customer, times the probability that we make a sale with the second customer, times the probability that we make a sale with the third customer, ties to probability that we make the sale with the fourth customer.
01:04
The probability of making a sale with any particular customer is independent of whether you made a sale or not with the previous customer or with the customer that's about to walk in the door.
01:15
So these are independent events.
01:17
So when you're looking for compound, the probability of compound independent events, you just multiply their individual probabilities.
01:25
These are supposed to be s's not look like fives.
01:34
Okay, so the probability that we make a sale to that first customer, 0 .21, times the probability we make a sale to the second customer, 0 .21, times the probability that we make a sale to the third customer, 0 .21.
01:50
Times the probability that we make a sale, this isn't this, times the probability that we make a sale to the fourth customer, times the 0 .21.
01:58
So this is really 0 .21 to the fourth hour...