system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do scientific calculators include "RAN#" and what can it be used for?

RAN# on calculators mean Random Number, and always give you a number that is three decimal digits, 0.345, 0.466.  Why do calculators have the RAN# key on them if it's never an exact number?  Why is it always a three decimal number?  What could it be used for?
gpt
it is an "exact number" it's just not an integer.

A lot of statistics deals with random numbers and in that context knowing the result will be anywhere between 0 and 1 is helpful.  Being able to get a set of random numbers on demand is useful to test out various theories.  If a calculation is expect to work for any number between 1 and 10000 you can try a random number by using (RAN# * 10000).  For graphing calculators functions like that are also used for games (shuffling cards, moving enemies, determining dice rolls, etc.)