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 Standard Deviation Symbol Tutorial   Education Standard deviation symbol help is used to defines about the statistical population, a grouped data set, or a probability distribution is the square root of its variance. Standard deviation symbol help is mostly used calculate the deviation or dispersion, being algebraically more tractable though practically less robust than average absolute deviation. Through online the standard deviation symbol help is for grouped data learning, tells about low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data spread over a large range of values. Standard deviation is a measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation.Standard deviation calculated from Square root of variance. In finance, standard deviation is used to measure the investment's volatility. Standard Deviation is the determinati...