Mr. Coffey's class conducts an investigation to find how quickly the height of water in a half-gallon jug changes after a small hole is created near the bottom of the jug.
The class finds the function H(x) = 0.01x2 – 2.77x + 136.51 models the height,
in millimeters, of water x seconds after the hole is created.
What is the average rate of change, in millimeters per second, for the period of 37
to 53 seconds? Round your answer to the nearest hudredth.