stats_dens_normal

(PECL stats >= 1.0.0)

stats_dens_normal — Probability density function of the normal distribution

说明

stats_dens_normal ( float $x , float $ave , float $stdev ) : float

Returns the probability density at x, where the random variable follows the normal distribution of which the mean is ave and the standard deviation is stdev.

参数

x

The value at which the probability density is calculated

ave

The mean of the distribution

stdev

The standard deviation of the distribution

返回值

The probability density at x or FALSE for failure.

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