The measure of the dispersion which ignores signs of the deviations from a central value is _______.

range

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quartile deviation

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standard deviation

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mean deviation

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Solution

The correct option is D mean deviation
Mean deviation is the arithmetic average of the deviations of the observed values from an average of the observed values. While calculating mean deviation, mod function is used which makes all the deviations positive. Therefore, it ignores the negative signs of the deviations.

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What is the principal drawback of mean deviation as a measure of dispersion?

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