(PECL stats >= 1.0.0)
stats_dens_normal — Probability density function of the normal distribution
$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.
xThe value at which the probability density is calculated
aveThe mean of the distribution
stdevThe standard deviation of the distribution
The probability density at x or false for failure.