00:01
This is a probable question.
00:02
So first of all, we need to get the probability here.
00:06
So the probability medical bills received by the patients are not right, which is 7 out of 10 here.
00:13
So the probability of success here is 7 out of 10, which is 0 .7 here.
00:20
So that means this is the problem that the bill just contain errors.
00:26
So let's take a look at the part a.
00:29
So in this case, there are a sample of nine.
00:32
So the sample size was given as nine here, and it probably is the same.
00:36
To solve this question, we're going to use the binormal distribution.
00:39
Let's say xb, the random variable here, which is binomally distributed.
00:42
This is nine and 0 .7 here.
00:44
So what do we have to do? exactly zero bills will contain errors, so that this is the probability of x is equal which is 9 -0 combination times.
00:53
This is 0 .7 to the power 0, and 1 minus 0 to the power, 9 minus 0, which is, well, which is nine here.
01:02
So 9 -0 combination is 1 and the power of 0 is 1.
01:05
So we just left 0 .3 to the power 9 here.
01:07
This is 0 .3 to the power of 9.
01:10
So the answer would be which is 0 .000, 0 -0 -0 and 2.
01:15
This is the answer with this question here.
01:18
So with four decimal places we can just write this answer as 0 .0 -0.
01:24
This is the answer.
01:26
And what about being here? again, so the is 9 and the p is 0 .7 here so in this case we want exactly three bills will contain our sphere so this is 9 3 combination and 0 .7 to the power of 3 and 1 minus 0 .7 to the power of which is 6.
01:48
So 9 3 combination which is 9 8 7 divided by 3 factorial and times 0 .7 to the power 3 and 0 .3 to the power six here...