00:01
Hello, so we have this information.
00:07
Let's move on the first part.
00:08
We want to get the cutoff score for the top 10%.
00:13
We have 100 students, so the top 10 is going to be the top 10%.
00:18
Okay.
00:22
So what we need to do first is to find the z score corresponding to the top 10%.
00:28
That z greater than z plus 10%.
00:33
Or is 0 .1 .1.
00:35
So 1 minus the problem.
00:38
Probability of z less than z is 0 .1.
00:44
So probability of z less than z is 1 minus .1, which is .90.
00:56
So we need to get the z value that gives the probability of .9.
01:03
So we get that from the z table.
01:08
So we're going to look for .90.
01:14
It's going to be 1 .2.
01:21
1 .25...