The Temperature (In °F) in a Certain City T Hours $T ( t ) = 50 + 14 \sin \left( \frac { \pi } { 12 } t \right)$

Short Answer

The temperature (in °F) in a certain city t hours after 9 A.M. is approximated by the function $T ( t ) = 50 + 14 \sin \left( \frac { \pi } { 12 } t \right)$ . Find the average temperature during the period from 9 A.M. to 9 P.M..