calculus
posted by Elizabeth .
In a certain city the temperature (in degrees Fahrenheit) t hours after 9 a.m. was approximated by the function
T(t) = 50 + 14sin((pi*t)/12).
Find the average temperature (in degrees Fahrenheit) during the period from 9 a.m. to 9 p.m.
I got (1/12)((12/pi)(50(12)14cos((pi)))+(12/pi)(50(0)14cos((0)/12))) but it's wrong...
Use wolframalpha website, it helps!
Thank you for your time!

calculus 
Roshan
1/120 integral from 0 to 12 for 50+14 sin(pit/12)
1/12 [50 t14.12/pi cos pit/12] from 0 to 12
50 t28/pi
=58.9
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