Calculates any one parameter of the normal distribution given values for the others

# stats_cdf_normal

(PECL stats >= 1.0.0)

stats_cdf_normal — Calculates any one parameter of the normal distribution given values for the others

### Description

stats_cdf_normal(
float `$par1`,
float `$par2`,
float `$par3`,
int `$which`
): float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the normal distribution. The kind of the return value and parameters (`par1`, `par2`, and `par3`) are determined by `which`.

The following table lists the return value and parameters by `which`. CDF, x, mu, and sigma denotes cumulative distribution function, the value of the random variable, the mean and the standard deviation of the normal distribution, respectively.

Return value and parameters
`which` | Return value | `par1` | `par2` | `par3`
--- | --- | --- | --- | ---
1 | CDF | x | mu | sigma
2 | x | CDF | mu | sigma
3 | mu | x | CDF | sigma
4 | sigma | x | CDF | mu

### Parameters

`par1`

  The first parameter

`par2`

  The second parameter

`par3`

  The third parameter

`which`

  The flag to determine what to be calculated

### Return Values

Returns CDF, x, mu, or sigma, determined by `which`.

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