Okay to let's say get a population variance from these are from a data set, we can do something like this. So our n is the end row of the data. So I can do something like this and to enroll of the data set, Okay, there we can do, how many are and is this available, so we can do something that is n. So we have one number 50, and low is our number of low wire authority. And then we can calculate the population variances in this formula here. So our various data and then this x is the Colorado variable, times n minus one divided by n. So I can do something like these So are veterans okay there was let's say in this data, how to calculate ah veterans for this separate line. So, I can do something that is separate line k comma t comma here times n minus one divided by n k times n minus one divided by n i will usually record here.

So, less China formula. So, variance the time this is variable times n minus one divided by n and I got 0.1122222 So, for the next Like, if I now learn is just a sample variance. So, I can do something that is payrolls and data set land. So, I got zero pi 68569352. So for the nice session three standard deviations, so I will discuss about standard deviation in this lecture.