Mrs. Alberts has taught seventh grade math for thirty years. Every year she calculates and records the class average on the final exam. The following dot plot represents these average scores from the past thirty years.

Calculate the mean of the average scores and round this value to the nearest whole number. Then, calculate the mean absolute deviation of the scores (using the rounded mean) and round it to the nearest whole number, as well. Express your answer as a numerical value.
MAD=