Multiple choice What is the mean deviation from the mean of the observations 10, 9, 21,16 and 24? 5.2 5.0 4.5 4.0 Reveal answer Fill a bubble to check yourself A Correct answer Explanation First calculate the mean: (10+9+21+16+24)/5 = 80/5 = 16. Then find mean deviation: sum of absolute deviations from mean divided by n = (|10-16|+|9-16|+|21-16|+|16-16|+|24-16|)/5 = (6+7+5+0+8)/5 = 26/5 = 5.2.