how do mean deviation and standard deviation measure the dispersion??
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Standard deviation (SD) is the most commonly used measure of dispersion. It is a measure of spread of data about the mean. SD is the square root of sum of squared deviation from the mean divided by the number of observations. This formula is a definitional one and for calculations, an easier formula is used.
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Standard deviation (SD) is the most commonly used measure of dispersion it is a measure of spread of date about the mean. SD is the square root of sum of square deviation from the mean divided by the number of observations. for formula is a definitional one and for calculations, an easier formula is used.
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