Douring a recent snowstorm, John measured the total snowfall accumulated at the end of each hour. He recorded his results in the table below Time Snowfall Total 1 p.m. 2 p.m. 3 p.m 4 p.m. 5 p.m. 6 p.m. (in inches) 0.7 1.9 2.8 3 8 4.3 5.1 What is the approximate average rate of change of the snowfall between 1 p.m. and 6 p.m.? !PLEASE HELP!