00:01
So in this question, we need to find the sample variance of these three values, 35, 15, and 25.
00:09
So the formula for the sample variance is here.
00:15
This is the formula for the unbiased sample variance.
00:18
There's also a formula for the biased sample variance, which is the same except that n -minus 1, we use n.
00:25
But for this problem, we're going to go ahead and assume that we want to compute the unbiased sample variance.
00:32
So this formula means that the sample, that the variance of the sample is defined as the sum of all the values in the sample minus the sample mean.
00:45
We'll talk about that in a second, squared.
00:48
The sum of these squares divided by the total number minus one.
00:53
So first we're going to have to compute the sample mean...