What it says on the tin, something like:

timeOut [<min>, <mid>, <max>]

• Would return the same as the timeouts in triggers and waypoints do (as in use the same function used there)
• Example: sleep (timeOut [10,20,30]);

probability <value 0-1>

• to be used in things like scripted 'Probability of Presence', as in return boolean if the probability is true or false (would use the same calcs that is used to determine probability of presence in the editor)
• Example: if (probability 0.3) then {*create vehicle*};