Statisticshard · Past Paper
A student's marks in 5 subjects are 70, 75, 80, 85, and 90. What is the mean absolute deviation about the mean?
A6
B80
C30
D10
✓ Correct Answer: A — 6
Mean = 80. Deviations from 80 are: |-10|, |-5|, |0|, |5|, |10|. Sum = 30. Mean Deviation = 30/5 = 6.
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