00:01
This question asks us to sketch the area under the standard normal curve over the interval negative 2 .17 and 1 .27.
00:12
So i have our standard normal curve drawn out here.
00:16
So it gives us the z score of negative 2 .17.
00:21
So that's going to be over here to the left of the 0.
00:25
And the positive z score of 1 .27.
00:29
It's going to be to the right of the 0.
00:34
It wants the area between these two points.
00:38
So if we draw each up to where the curve is, it's going to be the area in between here.
00:52
Now it also asks us to find the specified area.
00:56
So to do this, we'll need to look up each z score in the z table i have over here to the left.
01:02
So let's start out with 1 .27.
01:06
1 .27.
01:07
If you look at the bottom table here, we find 1 .2 on the left.
01:12
Go over to the point seven at the top, meet in the middle of those, and we find right there, 0 .8980.
01:23
So our z score of 1 .27 translates to 0 .8980.
01:30
Now let's do the same thing for the other z score, negative 2 .17...