Probability mass function of the binomial distribution

# stats_dens_pmf_binomial

(PECL stats >= 1.0.0)

stats_dens_pmf_binomial — Probability mass function of the binomial distribution

### 説明

function 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`.

### パラメータ

`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

### 戻り値

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

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