00:01
Okay, so i see that you need help with this question and this wants you to determine the arithmetic mean, the median and mode of the ages of employees in company abc.
00:13
So first of all, the amount or n that we're going to do is 1 or we're going to total up the frequency.
00:28
So 1 plus 2 plus 4 plus 8 plus 12 plus 25 plus 16 plus 5 plus 3 and that's 76.
00:41
The lower class boundaries are 19, 24, 29, 34, 39, 44, 49, 54 and 63.
00:59
The cumulative frequency is 3, 8, plus 24, plus 49, plus 61.
01:20
So that's 61, that's 69, 73, 75, 76.
01:30
Okay, and then it wants the x1 value.
01:36
So i'm going to take 59 plus 63 and divide it by 2 and i'm going to get 61.
01:45
54 plus 58, divide by 2 and i'm going to get 56.
01:52
So this one's going to be 51, 46, 41, 36, 31, 26 and then 21.
02:04
And now i'm going to multiply, so this one's 61, 56 times 2 is 112, 4 times 51 is 204, 8 times 46 is 368, 12 times 41 is 492, 25 times 36 is 900, 31 times 16 is 496, 5 times 26 is 130 and then this one is 63.
02:50
And i'm going to total up all of these numbers.
02:54
So i have 61 plus 112 plus 204 plus 368 plus 492 plus 900 plus 496 plus 130 plus 63.
03:11
And that's a total of 2 ,826 and i'm going to divide that by 76 and that's going to be 37 .18.
03:26
And the mode is going to be, the highest one is 61, so that is going to be 61.
03:42
And then what i'm going to do is, okay and now i have to find the mean absolute deviation...