(PECL stats >= 1.0.0)
stats_rand_gen_normal — Generates a single random deviate from a normal distribution
stats_rand_gen_normal ( float $av , float $sd ) : float
Returns a random deviate from the normal distribution with mean, av, and standard deviation, sd.
av
The mean of the normal distribution
sd
The standard deviation of the normal distribution
A random deviate
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https://www.php.net/manual/en/function.stats-rand-gen-normal.php