00:01
So here for the first question, the probability of a damaged piece of equipment coming off the production line is like we choose randomly 15 units, right? and we have three damages.
00:21
So the probability is we have three out of 15 here, which is 1 over 5 and which is point to here.
00:29
Right, we have three damage units among 15 randomly selected ones.
00:37
So probably 3 out of 15, which is 0 .2.
00:40
Second, and both must fail to fail the system.
00:48
So pay is equal to pa times pb, right? they need to happen at the same time.
00:55
And then this is 0 .2 times 0 .1, which is 0 .1.
01:00
0 .02 here.
01:02
So the probability to fail the system is fairly low here.
01:07
And now for the last question, we have a system.
01:10
We have a series system, not parallel as in the second question...