00:01
It is given in the question that there are two z values are given.
00:05
If there are z values, that means this is a standard normal distribution.
00:09
So that means the mean value here is zero.
00:18
So the mean value is zero.
00:22
And the standard deviation, standard deviation, which is denoted by the sigma notation, that should be one.
00:28
Because this is a standard normal distribution.
00:30
So what are the given z values here? so the z1 is negative 1 .64 and z2 is 1 .64.
00:39
Let me just graph this situation first.
00:42
This is a normal distribution and this is the mean value which is 0.
00:47
Negative 1 .64 is here and 1 .64 is here.
00:52
And we need to get the area of this shaded region...