## How to Calculate Standard Deviation from Probability

If $X$ is a normally distributed variable with mean $\mu =$ and standard deviation $\sigma =$ find one of the following probabilities: $P~($ $X$ $~)$ $P~(X>$ $)$
`

## Standard deviation calculator (σ)

Normal distribution calculator. Enter mean (average), standard deviation, cutoff points, and this normal distribution calculator will calculate the area (=probability) under the normal