Records Indicate That T Hours Past Midnight,the Temperature at the Local

Multiple Choice

Records indicate that t hours past midnight,the temperature at the local airport was $f ( t ) = - 0.3 t ^ { 2 } + 4 t + 10$ degrees Fahrenheit.What was the average temperature at the airport between 8:00 A.M.and noon? Round your answer to one decimal place,if necessary.

A) 3.9 degrees F
B) 9.6 degrees F
C) 98.0 degrees F
D) 19.6 degrees F