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OANDA explores Bitcoin's price history from 2009 to 2025, with key market events, data charts, and insights into its rise and ...

Standard deviation (σ) is an investing metric used to measure the variation of data points around the mean (average) of a data set.

Calculating the standard deviation and T-Value against that data set results in a realistic range against the historic data.

Standard Deviation: In Defense of an Often-Dismissed Investing Metric Debunking three arguments against this valuable risk-assessment tool.

What Is the Normal Distribution? The normal distribution formula is based on two simple parameters— mean and standard deviation —that quantify the characteristics of a given dataset.

The standard deviation, sometimes called bell curve, describes the amount of variation in a data set by measuring and averaging, how much each value in the data set varies from the calculated mean.

Learn to interpret range and standard deviation for better insights into your data set's variability and consistency with our expert statistics guide.