00:02
So we have our values here and i'm going to put down what the midpoint is for each of these classes.
00:07
And so i added together and divided by two and five or find out that the distance between the low and the high was 50.5.
00:12
So added 0.25 to each of the low values.
00:17
And so we have 10.2 10.7, 11.2, and then 12.2, those are the midpoint.
00:26
And then we had frequencies of 2, 8, 6, three and one.
00:31
Let's move that six down there.
00:33
And so those are our frequencies.
00:35
And so we want to find our meaning and our standard deviation, i believe.
00:39
I'm gonna double check, yep, sample standard deviation.
00:42
So let's estimate the mean.
00:44
And so that's going to be approximately equal to and by the way that some of these numbers, there are 20 of them.
00:50
So we're adding up 20 numbers and we have 10.2 and that's going to occur twice and we have 10.7 and that's occurring eight times and we have 11.2 and that's occurring six times and 11.7 that's occurring three times and 12.2 is occurring just once and that's supposed to be a two.
01:14
There we go...