Four days' temperatures were recorded for Wayupnorth, Canada. The temperatures were: -36 degrees Fahrenheit, +13 degrees Fahrenheit, -15 degrees Fahrenheit, and -10 degrees Fahrenheit. What was the average number of degrees (Fahrenheit) in Wayupnorth, Canada on the 4 days recorded?
Please reason step by step, and put your final answer within \boxed{}.
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