How does the mean absolute deviation (MAD) of the data in set 1 compare to the mean absolute deviation of the data in set 2?

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce

8p+(-9)

(-9)3p+5p and you can swith em around

except if the answer is in the value of money, then, it will matter. it will have to be $0.40, but i can tell this is not a money question, so .4 should be the right one.