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variance in math definition. The Variance is a measure of how spread out numbers are It is the average of the squared differences from the Mean. In probability theory and statistics variance is the expectation of the squared deviation of a random variable from its mean.
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The average of the squared differences from the Mean. The sign of the covariance of two random variables X and Y. In probability theory and statistics variance is the expectation of the squared deviation of a random variable from its mean.
The Variance is a measure of how spread out numbers are It is the average of the squared differences from the Mean.
Studying variance allows one to quantify how much variability is in a probability distribution. It is denoted by the symbol. So lets just a bit. The variance is a way of measuring the typical squared distance from the mean and isnt in the same units as the original data.
