6. Find the mean deviation about the mean.
10 | 4 | 40 | 40 | 160 |
30 | 24 | 720 | 20 | 480 |
50 | 28 | 1400 | 0 | 0 |
70 | 16 | 1120 | 20 | 320 |
90 | 8 | 720 | 40 | 320 |
= 80 |
= 4000 |
=1280 |
Now, we calculate the absolute values of the deviations from mean, and
= 1280
Hence, the mean deviation about the mean is 16