What is the correct mean absolute deviation of the 10 plants?

Question

Mr. O'Lear is conducting an experiment that involves 10 plants. He initially determined that the plants had a mean height of 72 centimeters and a mean absolute deviation of 8.5 centimeters. He later discovered that he made two errors in the height measurements of two plants. The table shows the incorrect and the correct measurements of the two plants.

Correct Incorrect

78 73

65 70

Answer 1

The sum of the absolute deviations will remain the same, so the mean deviation will remain the same.