The mean deviation of the observations 3, 5, 9, 1 and 2 about their median is June 13, 2021 – by admin Question: The mean deviation of the observations 3, 5, 9, 1 and 2 about their median is A. 2.4 B. 2.2 C. 3 D. 2.8 Answer» b. 2.2 Note: The above multiple-choice question is for all general and Competitive Exams in India.