1. The problem statement, all variables and given/known data The mean daily temperature in degrees fahrenheit in Athens, GA, t months after July 15 is closely approximated by T=61+18cos(πt/6) Find the average temp. between September 15 (t=2) and December 25 (t=5). 2. Relevant equations T=61+18cos(πt/6) 3. The attempt at a solution Can I just plug in t=2 and t=5 into the equation, add the answers, then divide by two to get the average temp. Or do I have to use integration. I'm not sure because the question is asked in the chapter on integration but it doesn't look like I need to use it.