00:01
So you have a binomial setting in which the number of trials is five.
00:05
We have our probability of success is 0 .78, and we have our probability of failure is 0 .22.
00:13
And x is the number of successes.
00:16
And so i've used the formula for binomial probability in order to find all of these values, which is also available on your software with binomial pdf, putting in the number of trials, the probability of 0 .78 for the success, and then whatever the x value is for that success.
00:38
And i've listed those probabilities down.
00:40
Now, we can use our table to answer all of the questions that are probability questions.
00:46
And the probability of having three successes is this 0 .2297.
00:51
Less than are equal to three is going to accumulate all of these values, these four values.
00:59
And you can sum that.
01:00
You can also use your binomial cdf to accumulate those downward.
01:06
And that comes out to be 0 .3041.
01:11
Continuing, now we want to find the likelihood of less than three.
01:15
And less than three is 0, 1, and 2.
01:17
And so we can just take this answer and subtract away the 0 .2297, or just add the 0 .1 and 2 together.
01:26
So when you do, you get this value...