Rita is reviewing her electricity bills for the past year. The monthly bills were: $92, $98, $90, $99, $96, $91, $89, $106, $95, $102, $96, $99.
Select the correct answer.
Which measure will help Rita calculate how much the electricity bills vary, on average, from the mean billed amount?
A. interquartile range
B. range
C. median
D. mean absolute deviation