Chapter 12 - Data Analysis and Probability - 12-3 Measures of Central Tendency and Dispersion - Practice and Problem-Solving Exercises - Page 731: 33

Mean: decreases by amount subtracted median: decreases by amount subtracted Mode: decreases by amount subtracted range: no change

If all numbers are decreased by an amount, then the average of those numbers would also decrease by that amount. The median also is decreased since all numbers are affected. The mode would be decreased by that same difference.