Same chances for everething

I Wanna to do a mod that add pills based no the binding of Isaac pills, the effects are Easy, i only need to use /atributte, but I have a problem whit a thing: Pills will be Random per world (the orange pill can give you Healt up in a world, but in other, can be Speed down) and I dont now how to do a random chance base to set what effect gives orange pill, i now about Random 0.1, but i Wanna that the chance be fair, if I use:

If Random 0,1 ≥ 0,5 do

Set text variable "orange pill effect" to "Healt up"

If not

Set text variable "orange pill effect" to Healt down

The problem is: that procedure only work for two effects, but i Wanna to add More effects, somenone can help me? Please

I have no problem whit evade that a pill gives the same effect of another pill.

I try the next procedure:

Set "variable" to Random 0,1

If "variable" ≥ 0,49 do

Set "orange pill effect" to "Healt down"

If "variable" ≤ 0,5 do

Set "orange pill effect" to Healt up

It dont work, i do it bad or what happened?

Please help ;_;