00:01
There is given a normal distribution.
00:03
The mean value given here, so the mean, denoted by moot, this is 72 and the standard deviation, which is denoted by sigma.
00:12
That was given as four here.
00:15
And there is given a definition here.
00:17
So a is the top 8%.
00:19
Let me graph the normal distribution here.
00:22
And by the way, before graphing them, i'm going to define the random variable x, which is normally distributed.
00:28
This is 7 .2 and 4.
00:29
Let's say this is the minimum value for a value let's say this is x1 and this is the top 8 % and the next 15%.
00:40
So the next 15 % means this one here.
00:43
Let's say this is x2 and this region is the 15 % is that the 15.
00:48
Is that the 15? let's check.
00:50
Yes, this is the 15 and this is for grade b.
00:53
This is for grade b and this is for grade a.
00:58
So we have to look at we get the value, the bottom cutoff value for the b here.
01:05
So we need to get the value of x2...