What is the mean absolute deviation of 100, 100, 100, 20, 20, 80

Don't know but I know this The Mean Absolute Deviation is calculated in three simple steps.

1) Determine the Mean: Add all numbers and divide by the count

example: the weights of the following three people, denoted by letters are

A - 56 Kgs

B - 78 Kgs

C - 90 Kgs