distinguish between mean deviation and standard deviation
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Standard deviation is basically used for the variability of data and frequently use to know the volatility of the stock. A mean is basically the average of a set of two or more number. Mean is basically the simple average of data. Standard deviation is used to measure the volatility of a stock.
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Standard Deviation: The Difference. The standard deviation (SD) measures the amount of variability, or dispersion, for a subject set of data from the mean, while the standard error of the mean (SEM) measures how far the sample mean of the data is likely to be from the true population mean.
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