00:01
So for this problem, where we're trying to find on which test did he do relatively better, relatively better, we can quantify that as how many standard deviations, how many sigma away from the mean did he score? effectively, if we have that all of the data is really tightly packed around the mean value, and then we have a value that's a little bit further or that's quite a distance away, that would be more significant than if we had data that was more spread out, and he still got the exact same result.
00:49
So for the lsat, the number of standard deviations, typically we call that a z score, is going to be 172 minus the mean value 151, divided by the standard deviation, 10.
01:05
So, 172 minus 151, let's see here, that would be 21.
01:10
So we have 21 over 10, or his z score is roughly 2 .1.
01:14
And then for the mcat, zd score is going to be 37 minus 25 .1 divided by 6 .4...