(PECL stats >= 1.0.0)
stats_dens_normal — Probability density function of the normal distribution
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.
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.
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https://www.php.net/manual/en/function.stats-dens-normal.php