00:01
Okay, in this question, it says 69 .1 % of the standard normal curve lies to the left of z.
00:07
Okay, so first i'm going to show you how to solve this question using a z table.
00:11
What you would typically do with the z table here is first try to draw a sketch of the problem, which i have done.
00:20
I drew a standard normal curve.
00:22
I have my center at zero.
00:25
And since i know i'm dealing with a percentage higher than 50%, i know the zs.
00:30
Score that i'm looking for is to the right because i'm more than 50%.
00:35
When we look at this coming, we always look at it from bottom up.
00:39
So i know once i hit zero, that's 50 % and we'd have to go higher to the right to get the 69 .1.
00:46
All right.
00:47
So our goal is to look on a z table and see if we can find a z score that goes with 69 .1%.
00:55
So the z score we're looking for would be associated with 0 .6 .6.
01:02
The closest thing we could find.
01:05
Okay, going to positive version of the z table, looking for 0 .691...