00:01
Here, in this question, this question is about a large chain retailer who purchase a certain kind of electronic devices from the manufacturer.
00:16
And here, in the solution of this question, we need to solve the binomial expression.
00:22
So for part a, as given p is equal to 0 .03.
00:28
And only for the sample size n, which is 20.
00:31
So our probability for getting at least one defective item among these 20.
00:51
So our probability of this event will be as p.
00:54
X is greater than or equal to 1, which can be simplified as for the complementary event.
01:00
1 minus probability of getting x is equal to 0, which is equal to 1 minus 0.
01:10
20 into 0 .03 to the power of 0 multiplied by 1 minus 0 .03 and its power will be 20 minus 0.
01:27
So for the when we calculate r value will be equal to 0 .456.
01:34
So let's take this event as probability of the event e1.
01:38
So here we have our solution for part a that our event, probability of the event is equal to 0 .456...