stolen from elsewhere, forget where. Not used it myself.
(and any other disclaimers I could add but can't think of right now)
Quick little formulat to figure out how often it will trigger: ((1-x*0.05)^y)*100=z
where:
x=amount of points your guys are placing in MS
y=the number of people putting the points in
z=% chance of it triggering on a given play
pow(base,power)
100
0 dots
1.0E-48 .1^48