00:01
So we want to find the standard deviation of this set.
00:03
So to find the standard deviation, the first step is to find the mean.
00:06
So the mean is going to be equal to 1 plus 2 plus 5 plus 7 plus 8, all of that divided by 5.
00:15
And if you evaluate that, that comes out to 4 .6.
00:20
So our mean is 4 .6.
00:21
And using this, we can find the standard deviation.
00:23
So the formula for standard deviation is first we have to find variation, which is represented by this symbol squared.
00:30
And variation is equal to each number in this data set.
00:35
So like one minus the mean.
00:38
And then that's squared and then added.
00:40
So now the next one will be two minus the mean and then squared...