Question

Find the mean deviation of the following :2, 9 , 9 , 3, 6, 9, 4

• A. 2
• B. 2.57
• C. 3
• D. 3.52

Answer 1

Answer:

B. 2.57

Mean = {2 + 9 + 9 + 3 + 6 + 9 + 4}/7 = 42/7 = 6 Differences : 4, 3, 3, 3, 0 , 3, 2 Mean deviation = sum of differences / number of observations = {4 + 3+ 3+ 3 + 0 + 3 + 2}/7 =18/7 = 2.57