2009-08-31

Quick Dice Average

Quick way to find the average (expected value) of dice xDy: Take half of x, add one to y, then multiply the two. This is equivalent to what some refer to as "Gauss's formula" for summing a series. For example:

8d6 -> 4*7 = 28
12d4 -> 6*5 = 30
at

3 comments:

  1. K. BaileySeptember 2, 2009 at 2:46 AM

    I ran across this site recently which has been somewhat useful:

    http://catlikecoding.com/anydice/

    ReplyDelete
  2. RustySeptember 5, 2009 at 10:16 PM

    Thanks Delta and K. Bailey. Useful stuff.

    ReplyDelete
  3. pilesFebruary 9, 2016 at 2:49 AM

    Probably known to all, but it also works for odd x and/or y

    ReplyDelete