The temperature in Minneapolis over a 12 hour period can be modeled by the function C ( t ) = - 0.06 t 3 + 0.2 t 2 + 3.7 t + 5.3 where t is measured in hours, and t = 0 corresponds to the temperature at 12 noon. Find the average temperature during the period from noon until 7 p.m.
a) 114.6 degrees
b) 19.6 degrees
c) 0 degrees
d) 16.4 degrees
e) 3.9 degrees
f) None of the above.