CA Foundation · Quantitative Aptitude · Measures of Central Tendency and Dispersion
The mean deviation about the mean of the observations 4, 8, 10, 14 and 24 is:
The mean deviation about the mean is 5.6. The mean of the observations is 12, the absolute deviations are 8, 4, 2, 2 and 12, totalling 28, and dividing by 5 gives 5.6.
- A5.6Correct
- B6.0
- C10.0
- D6.4
Explanation
Mean = 60/5 = 12. Absolute deviations are 8, 4, 2, 2, 12, summing to 28. Mean deviation = 28/5 = 5.6. Option D (6.4) uses deviations from the median 10 incorrectly: 6+2+0+4+14 = 26, giving 5.2, so 6.4 is not valid either.
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