00:01
So in this question we need to say if, when we count the number of incorrect vouchers here, if this can be considered as a binomial distribution or not.
00:16
So here, because we know that this is the number of incorrect vouchers in the total of 270, so basically this is fixed.
00:25
We already know the number of vouchers that we have.
00:28
And we are counting how many of them are incorrect.
00:34
So because of this, in item a, we can say yes.
00:38
In item b, we need to compute what is the probability that the number here is zero.
00:43
And we can use the formula for the binomial distribution to compute this, which is given by out of the total 270, we want zero of them to be incorrect.
00:54
And the probability of being incorrect is this proportion, 26, out of this 2 .7.
00:58
To 170 because this is given by the question.
01:03
And here we should put the value of the number of incorrect falchers and then one minus the probability of being incorrect at power of the number of vouchers they are in this case correct...