-[I do recall asking how far apart these numbers are]-
Pov-ray uses the IEEE double floating point standard (unless you're
compiling it on a DEC VAX or something obscure), which has 52 bits of
fractional precision, which gives about 2^-52 as the distance between random
numbers. However, pov-ray actually uses a 32-bit linear congruential random
number generator, which only uses 32 bits of precision.

-[because the means of different samples from a given population are
normally distributed around the true mean of the population]-
Yes - or rather, they approach a normal distribution as the number in each
sample tends to infinity (the Central Limit Theorem)

-Chris

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