To find out your company's average monthly utility bill over the last year,you would need to calculate the ________ of the last twelve bills.

A) mean
B) median
C) mode
D) highest

To find the average monthly utility bill over the last year, we need to calculate the mean, which is the sum of all the bills divided by 12 (the number of months in a year). The median and mode are not appropriate in this scenario as they are measures of central tendency that are useful when dealing with skewed data or when looking for the most common value, respectively. The highest bill is not relevant in finding the average bill.