Average spending

If Rina's cell phone bills for the past five months have been $91, $69, $74, $56, and $70, what was her average cell phone bill for the past five months?

Correct answer:

a =  72 USD/m

Step-by-step explanation:

n=5  a=n91+69+74+56+70=591+69+74+56+70=72 USD/m

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