00:01
In this question, we are looking at complement events.
00:06
So suppose a is an event.
00:08
So a complement is the complement event to a, and that is the total opposite of the event a.
00:17
So we have a sample of 250 cell phone batteries.
00:22
I'm going to let x be the number of defective cell phone batteries in this sample.
00:26
In part one, the event is exactly 13 of the cell phone batteries are defective.
00:32
So we are looking at the event x equals to 13.
00:39
So this is the event.
00:41
So the complement to this event will be everything else that is not this event.
00:47
And so that will be x is not equals to 13.
00:51
So the number of cell phone batteries which are defective is not equal to 13...