Returns the value of the density function for a standard normal distribution.

**Sample Usage**

PHI(0.5)

**Syntax**

PHI(X)

- X - The input to the standard normal distribution function.

**Examples**

PHI(0.5) returns a value of 0.352

**Notes**

- This is a special case of the NORMDIST function, where mean is 0, standard deviation is 1, and 'cumulative' is false.