First find the mean: Which is the sum of all of the values divided by number of values. Using online calc: mean = 33.1. Now to find the MAD or mean absolute deviation: which is |value-mean| for each value. For example abs(34-33.1) = 0.9 this is the absolute deviation. Now we do this for each point and find the mean of all of those values. Using online calc we get Mad = 4.5 So one away from the mean up and down would be 37.6 — 28.6 So values one MAD away plus or minus would be: 34,37,32,34,35,33,30 Which is 7.
