The **x**-bar is the symbol (or expression) used to represent the sample **mean**, a **statistic**, and that **mean** is used to estimate the true population parameter, mu.

what is Sigma X in statistics? The symbol Σ **X**i represents the sum of all scores present in the population (say, in this case) **X**1 **X**2 **X**3 and so on. The symbol N represents the total number of individuals or cases in the population.

Secondly, what does X mean in standard deviation?

Overview of how to calculate **standard deviation** where ∑ means sum of, **x is** a value in the data set, μ **is** the **mean** of the data set, and N **is** the number of data points in the population.

What does σ mean?

**Σ** This symbol (called Sigma) **means** sum up I love Sigma, it is fun to use, and can **do** many clever things.