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Values 10, 20, 30 occur 3, 4 and 3 times. Find the mean deviation about the mean.
A5
B6
C8
D4
Answer & Solution
Correct answer: B. 6
Mean is 20, so weighted absolute deviations are 30, 0 and 30, totalling 60, and 60 over 10 is 6.
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