00:01
Let me take notes what's given here.
00:03
So the g's last statistic score was 72, let's say.
00:08
This is defined as the x, which is 72 here, and this is approximately normal distribution.
00:15
So the class mean, denoted by mu, which is 67, and the standard deviation, so the standard deviation denoted by sigma, which was given as 3 here.
00:26
So because we know this is a normal distribution, i can define a random variable x, normally distributed, so the mean is 67 and the standard deviation is 3.
00:36
So what we have to do, first of all, let me just drill the normal distribution and we can just see where he is.
00:43
Here is the mean score and his score is over here, which is 72.
00:49
So that means he just passed away many of the students because these are the regions that this guy has the greater score for, this region here.
01:00
So in order to get the area of this region, we have to use the calculator, which is the random variable x is less than 72.
01:09
To get this one, i'm going to use the graphing display calculator application normalcdf.
01:13
So there is no inner lower boundary that goes to negative infinity.
01:17
I'm going to put negative 1 in 99, that means negative 10 to the power 99...