00:01
Today i'm going to show you how to sell this problem.
00:04
Now this problem asks, the probability that a certain make of car will need repairs in the first seven months is 0 .3.
00:10
A dealer sells five such cars.
00:12
What is the probability that at least one of them will require repairs in the first seven months? round your final answer to four decimal places and guide me step by step on how to solve this problem.
00:22
Okay, now this thing is very straightforward.
00:25
This dealer sells five cars, let's say these are the five cars.
00:28
And we're trying to find the probability that at least one of them will require repairs in the first seven months.
00:34
So it could be, this one could be, this one could be any of these, right? and we're looking for the probability that at least one of them requires a pairs.
00:41
And there's a really easy way to do this.
00:44
The probability of anything must have to mess out to one, right? so since we're looking for the probability that at least one of the cars won't require repairs, we could just take one minus the probability of none that dealing repairs.
00:58
So the probability of zero cars needing repairs.
01:03
So to do that, the probability that a certain makeup car of need repairs and the first seven months is 0 .13...