2 The temperature of a mug of hot chocolate t minutes after it is prepared is given by the function H t where H is measured in degrees Fahrenheit Selected values of H t are given below t 0 2 5 10 13 20 H t 170 137 107 83 77 72 Find the average rate of change of the temperature of the hot chocolate between t 0 and t 2 Use proper units in your answer