# stats_dens_pmf_binomial

(PECL stats >= 1.0.0)

stats_dens_pmf_binomial — Probability mass function of the binomial distribution

### 说明

stats_dens_pmf_binomial ( float `$x` , float `$n` , float `$pi` ) : float

Returns the probability mass at `x`, where the random variable follows the binomial distribution of which the number of trials is `n` and the success rate is `pi`.

### 参数

`x`

  The value at which the probability mass is calculated

`n`

  The number of trials of the distribution

`pi`

  The success rate of the distribution

### 返回值

The probability mass at `x` or `FALSE` for failure.