part 2: The interquartile range (IQR) is the length that contains the middle ______ of the values in a data set.
part 1: Range. Largest data value minus the smallest data value.
part 3: The mean absolute deviation is the average of the differences (deviations) of each value in the data set from the mean of the data set. or in other words, add all the numbers together and subtract them.