Select the correct answer.
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.
Which measure should Rita use to find the average monthly bill for the year?
A.
range
B.
interquartile range
C.
median
D.
mean