(rand-pick ..args)
  args: one or more arguments (any type)
  returns any type
F

Randomly selects one of its arguments.

For example, (rand-pick 'a 10 #t) has a one-in-three chance of returning 'a, a one-in-three chance of returning 10, and a one-in-three chance of returning #t.

chance?
rand-weighted