Answer:
Average change in temperature is - 2.8 Fahrenheit per hour.
Step-by-step explanation:
Average change in temperature is the change in temperature divided by the time taken for the change.
Change in temperature = (-11.2) F- 0 F
                   = -11.2 F
Time taken for the change in temperature = 10 pm
                                 = 4 hours
Average change in temperature = Change in temperature / time taken for the change
                           = - 2.8 Fahrenheit per hour