00:01
80, 70, 90, 90, 90, 70, 60, 90, and i think that bottom one's an 80.
00:13
So what we need to do is we need to find the deviation from the mean, and we need to find the deviation squared.
00:20
So the first thing we need to do is find the mean.
00:22
So let me go do that real quick.
00:26
Okay, there we go.
00:31
So that adds to be 760, so i'm going to divide that by the total 10 and be 76 as my mean.
00:38
So we're going to go and find out what this is going to be, how far each one of these is from the mean, and then square it.
00:46
So 70 minus 76 is negative 6.
00:49
I'll square that to get 36.
00:51
I'm going to go ahead and put that everywhere i see 70.
00:54
So now we're going to go to 50...