00:03
Okay, so we're looking at gpas and getting into college.
00:09
In this specific college, the mean gpa is 3 .8, standard deviation is 0 .08.
00:18
So, student a has a gpa of 3 .75.
00:21
We want to know their z score.
00:23
Z score is the data point minus the mean over the standard deviation.
00:29
So, z score is going to be this data point minus the mean over the standard deviation.
00:44
Okay, so i take 3 .75 minus 3 .8 and then divide by 0 .08.
00:54
And i get negative 625.
01:00
Okay, so that's the z score for student a.
01:06
Student b's z score is negative 0 .875.
01:12
So which student would we pick, student a or student b? we should pick student a because they're closer to the mean of 3 .8 than student b.
01:29
Student a is 0 .625 standard deviations below the main.
01:36
And student b is 8 .75, 0 .875 standard deviations below the mean.
01:45
Okay? so student a is closer to the mean.
01:48
It's not as far below the mean.
01:52
Okay...