आंकड़ों 2, 9, 9, 3, 6, 9, 4 का माध्य से माध्य विचलन क्या है: A. 42/7 B. 18/7 C. 2.5 D. 50/7

Mean = (2 + 9 + 9 + 3 + 6 + 9 + 4)/7 = 42/7 = 6. Absolute deviations: 4, 3, 3, 3, 0, 3, 2, which add to 18. Mean deviation = 18/7.