00:01
In this question, the range for this course is given here, which is the lower boundary as 300 and the upper boundary as 1800.
00:11
So we're going to use the rule of thumb to get the population standard deviation.
00:16
So how we can just use this one, let's remember this rule here.
00:20
So rule of thumb, so rule of thumb, which says the standard deviation, okay, the standard deviation, which is equal to maximum minus minimum and divide by four.
00:33
This is an approximate value here.
00:35
So the standard deviation denoted by sigma, this is 1800 minus 300 divided by four.
00:41
This is 1500 and divide by four, which would be 375.
00:46
This is the standard deviation here.
00:48
And the next part, we have to find the sample size here.
00:54
In order to get the sample size, let me take notes, the given values, the confidence level given as 0 .90.
01:01
And we know the population standard deviation here.
01:03
So the sample size, which is denoted by n, we have to find the n value here.
01:09
And the next step, so the margin of error was also given here...