In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean.

Is deviation the same as mean?

Standard deviation is basically used for the variability of data and frequently use to know the volatility of the stock. A mean is basically the average of a set of two or more numbers. Mean is basically the simple average of data. Standard deviation is used to measure the volatility of a stock.

What do we mean by deviation?

Deviation means doing something that is different from what people consider to be normal or acceptable. ... In statistics, deviation is the difference between the value of one number in a series of numbers and the average value of all the numbers in the series.