$$\text{Mean} = \bar{x} = \dfrac{\sum x}{n}$$

$$\begin{aligned}\text{Standard deviation} = \sigma &= \sqrt{\dfrac{\sum x^2}{n} - \left(\dfrac{\sum x}{n}\right)^2} \\ &= \sqrt{\dfrac{\sum(x - \bar{x})^2}{n}}\end{aligned}$$