00:01
We have been given a picture of a normal curve.
00:03
So let's have a look at this.
00:04
The total area under a normal distribution is 1.
00:09
It's a probability curve.
00:11
And it is symmetric.
00:12
The area below the mean is 0 .5, above the mean is 0 .5.
00:18
The mean is 0.
00:19
We're looking at z such that the area to the left of z is 0 .3897.
00:30
How do we go about finding this z score? okay, so you have two options here.
00:37
The first is to use a table.
00:40
If you're using the inverse cumulative table, you're just looking at the area to the left.
00:47
So you look at your table, you look for 0 .3897 in the probabilities, match it up to rows and columns, and you have your answer...