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Find the mean deviation about the median for the data: 340, 150, 210, 240, 300, 310, 320.

1. 52.4
2. 52.5
3. 52.8
4. none of these

Correct answer: 52.8

Solution

Sorted data has median 300; the mean of absolute deviations from 300 is 370/7 = 52.86, i.e. about 52.8.

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