00:01
This is a probability question here.
00:02
So someone buys a ticket for airline flight.
00:06
There is a 0 .095 probability that the person will know show up.
00:11
So i'm going to just denote this the probability of show up, which is 0 .095 as p here.
00:18
And what about here? so there are 21 tickets sold here.
00:22
So the n was given here 21.
00:24
So we're going to use the binaural distribution.
00:26
I can define the random variable x, which is binaumally distributed.
00:29
This is 21 and 0 .0995.
00:32
So no more than 19 passengers will show up here.
00:38
So no more than 19 passengers will show up means this is the probability of x's, which is less than or equal to 19 here.
00:46
Let me just rewrite this one here because we just define the x as the number of, the number of no show up.
00:55
If it says no more than 19 passengers will show up, so that means the probability of x should be greater than or equal to 21 minus 19, which is 2.
01:06
This is the probability we need...