00:01
There is given a compound event probability.
00:04
When we look at the given information here, we are going to use a binormal distribution for this question.
00:09
So let's take a look at the part a.
00:11
So first of all, the sample space was given as or the number of trial was given here 28.
00:17
And the probability of success, which was given as 0 .8.
00:21
So we can define the random variable x, which is binomally distributed.
00:24
This is 28 and 0 .8 here.
00:27
So what we need to get, the x is less than or equal to.
00:30
23.
00:31
This is a cumulative sum and it is very long to just calculate each of them separately, which means this is x is equal to 1 up to the probability of x is equal to 23 instead of this one.
00:44
I'm going to use the graphing display calculator application, the binom cdf.
00:48
So the n here 28 and the probability of success.
00:51
And they included x value which is 23.
00:54
Let's get the answer.
00:55
Press second variance in the binom cdf.
00:59
So this is 28 and then 0 .0.
01:01
0 .8 and then 23...