00:01
In this question, from the preliminary study, the probability of chip is defective will be equals to 21 by 100 that will be equals to 0 .21.
00:23
Now, a standard deviation that is sigma that is equals to under root np into 1 minus p.
00:36
Now, using the standard normal table, the g value at 95 percent confidence will be equals to 1 .96.
00:51
Now, here let us consider that n denotes the sample size and g is a standard normal variable and p denotes probability.
01:09
So, we know that margin of error is equals to g into sigma by under root n and from this we can say that sigma will be equals to under root 0 .21 into 0 .79.
01:39
Now, this comes as equals to 0 .407.
01:45
Now, from this considering the margin of error equation, we can write here as margin of error we have been given as margin of error we have been given as equals to 0 .05...