rnd

rnd(x)
Probability mass function of rnd(10).
Distribution	uniform
Mean	$(x+1)/2$
Standard deviation	$\sqrt{(x^2-1)/12}$

rnd(x) is a pseudo-random number function used in NetHack when a result should be unweighted. The range of values is between 1 and x inclusive (that is, 1 ≤ rnd(x) ≤ x). It is equivalent to rolling a die with x sides.

References

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