Grade 7 Math #11.3a, Compare differences in centers of variability

On my list to be remade. Too shaky and ERROR at 2:14, a multiple is a product of a number (multiples of 12 are 12, 24, 36, etc) .
An explanation of how to compare differences in centers of variability, find the mean absolute deviation (MAD) of a data set. Comparing two populations by using statistical measures. #11.3a
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