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Find the mean deviation about the mean for the following data : 17, 20, 12, 13, 15, 16, 12, 18, 15, 19, 12, 11

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We have, 17, 20, 12, 13, 15, 16, 12, 18, 15, 19, 12, 11 

Mean of the given data is 

The respective absolute values of the deviations from the mean , i.e. are 2, 5, 3, 2, 0, 1, 3, 3, 0, 4, 3, 4 

Thus, the required mean deviation about the mean is

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