Generate random numbers with fix probability

Question

I red a lot in the forum about this, but all answers were so specific to the the asked question. The nearest one I found to my need was:Probability Random Number Generator b

Answer 1

In your case you might generate random from 1 to 100 and then:

if random in 1:40 -> face 1
elseif random in 41:50 -> face 2
and so on. 

Of course, real code would be a little more complex to get real ranges and not hardcoded ifs