If we do not figure out a way to eliminate the negative signs all of the deviations will cancel one another out if we add them together. Find the sum of the absolute values of the differences. The Standard Deviation is a measure of how spread out numbers are.
T o find MAD you need to follow below steps.
After completing your three-column table find the mean of the absolute values in the third column. Next click cell B2. X Mid-Value of the class M Median. Here represents the summation.