Hi Krice,
Thanks for replying.  

I'm not quite sure what you are asking. I'm not a bot. And I'm not coding an automated Rogue-playing program, if that's what you meant.
Let me explain why I ask.
I heard about Rogue (and roguelikes) quite a few years ago, and have finally started playing it recently - command-line version 5.4.4 to be exact.
I like it a lot, and I had the idea to make a kinda table-top version to play with friends - and for that I'm trying to get an "appropriate" amount of suitable miniature figures. (think D&D or Warhammer figures)
Having looked through the source codes (or binary, in the case of MacRogue) I have the following monster lists, though I don't yet know which version I'd like to base the "boardgame" on:
ROGUE 3.5            ROGUE 5.4.4     EPYX 1985 GRAPHICAL MACROGUE
-----------------------------------------------------------------
giant ant            rattlesnake     rattlesnake
bat                  bat             bat
centaur              centaur         centaur
dragon               dragon          dragon
floating eye         ice monster     ice monster
violet fungi         venus flytrap   venus flytrap
gnome                -               -
hobgoblin            hobgoblin       hobgoblin
invisible stalker    phantom         phantom
jackal               emu             emu
kobold               kestrel         kestral
leprechaun           leprechaun      leprechaun
mimic                xeroc           xeroc
nymph                nymph           nymph
orc                  orc             orc
purple worm          jabberwock      jabberwock
quasit               quagga          quagga
rust monster         aquator         aquator
snake                snake           slime
troll                troll           troll
umber hulk           medusa          medusa
vampire              vampire         vampire
wraith               wraith          wraith
xorn                 black unicorn   ur-vile
yeti                 yeti            yeti
zombie               zombie          zombie
-                    griffin         griffin
But reading the code, and trying to statistically infer how many monsters of a given type can reasonably be expected to occur on the screen (board) at the same time, is not a simple task. I assumed there would be players who have a lot more experience playing Rogue than I do, and for whom it would be easy to give a quick guess, whether the guess would be 3 or 5 or 10 or whatever. As I said I've only just gotten into Rogue, so I don't know what is statistically "common", to phrase it that way.
I'm a newbie in the Rogue world, sorry if I'm asking stupid questions.