The tool tips say the chance to successfully reverse engineer a green item as being 20%. This is clearly rubbish. I've produced MANY MANY more greens than needed for a 1 in 5 hit rate.
I'm not sure if it's the SWTOR random number generator that's broken, or if the tool tip is wrong. Either way it should be fixed..
(and yes I know, 20% chance doesn't guarentee a 1 in 5 hit, but it should average out to that over time - and clearly, in this game it doesn't).
No, it shouldn't. 1/5 and 20% are two different things, and the number of times you'd actually have to make the roll in order to see if it's 20% or not is huge(at least a thousand), beyond that, computers aren't truly random.