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(a) An elementary measure of dispersion is
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Standard deviation (SD)
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Standard deviation (SD)
extra information ℹ️
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. ... The other advantage of SD is that along with mean it can be used to detect skewness.
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