What is standard deviation?
A value that describes how the data deviates from the mean
Standard deviation is a statistical measure that quantifies the amount of variation or dispersion in a set of data. It measures the average amount of deviation or dispersion from the mean, which is the central point or average value of a set of data.
In other words, standard deviation tells us how much the individual data points in a set of data differ from the mean. A low standard deviation indicates that the data points are close to the mean and there is little variation in the data, while a high standard deviation indicates that the data points are far from the mean and there is a lot of variation in the data.
Standard deviation is calculated by taking the square root of the variance, which is the average of the squared differences between each data point and the mean. It is often symbolized by the Greek letter sigma (σ) for the population and the Latin letter s for a sample.
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