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variance in math. The variance is often used to quantify spread or dispersion. So start by working out the mean of the set of values.
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Variance is a measure of how spread out a data set is. Variation is defined by any change in some quantity due to change in another. In other words variance is the mean of the squares of the deviations from the arithmetic mean of a data set.
Deviation for above example.
More specifically variance measures how far each number in the set is from the mean and thus from. In probability theory and statistics variance is the expectation of the squared deviation of a random variable from its mean. The average of the results is the variance. Calculating variance can be tricky but once you get the hang of the formula youll just have to plug in the right numbers to find your answer.
