# Standard Normal Distribution

**N(0, 1)**

The standard normal distribution has a mean of zero, **μ = 0**, and a variance of one, **σ = 1**.

Its density function is:

Its graph is:

The probability of variable, **X**, depends on the area of the shaded enclosure in the drawing which can be calculated using a table.

#### Standard Score

To use the table, the variable X must be distributed as N **(μ, σ²)** in another variable **Z** that follows **N (0, 1)**.

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