00:01
Let's complete the table here for the missing values.
00:03
You've done a lot of them, and you've done those correctly.
00:06
But what we need to do now is find the average, so we can compute that last column.
00:11
So for the average, we need to add up the fxm.
00:14
So i'm going to go add those up real quick.
00:16
So 241, 1944, 3062 .5, 1976, 871 .5, 753, 6271 .5, 753, 6277.
00:30
0 .5 .10.
00:34
So i'm going to add that up and i'm going to get 103 .65.
00:39
That's going to go at the bottom of that fm column.
00:41
I'm going to divide that by 84 to get a mean or average as we call, as they are calling it.
00:50
And it says to two decimal places.
00:52
So that's going to be 123 .39.
00:56
So for this column, i'm going to, the last column, i'm going to take the frequency.
01:00
So for this first one, to go three.
01:02
I'm going to give my mean 123 .39 or my midpoint, excuse me, my midpoint, different perverture 119 .5 minus my mean 123 .39 squared.
01:22
So i'm going to find the difference squared, multiply it by the frequency.
01:27
And i'm going to do this for all of this column.
01:30
So when i get that i'm going to go, let me go, i'm going to do this in a different order.
01:40
So we're going three.
01:51
Okay, so the first one be 45 .3 .9, two decimal places.
01:57
So let me go erase that, two decimal places.
01:59
That'll be better.
02:00
That's going to be four zero.
02:02
Now, i'm going to do the same thing for the rest of them.
02:04
So i'm going to do the next one be two.
02:06
And then i'm looking at a midpoint of 120 .5...