Ah, ok. I had forgotten about tolerance.

Is the way I'm looking at the calculations correct? So if 3v was required for the low end output voltage you would replace the fixed 200ohm resistor with say a 250ohm? (according to the table 3.0v is 491ohm)

A general note: The higher the resistance, the lower the voltage output and visa-verse.

So... 3v low end would require the pot at full resistance range plus the fixed resistor for a total resistance of 491 ohms or close to it. Using a 240 ohm fixed and a 200 ohm pot would be what you are looking for (440 ohms).

A 200 ohm pot w/ 10% tolerance can be any thing between 180 ohms to 220 ohms. That would make your total between 420 ohms to 460 ohms. And don't for get about the 1% fixed resistor tolerance of 237.6 ohms to 242.4 ohms

On some of my projects I had a bag of 200 ohm trimmer pots and I hand picked a pot that was as close to 200 ohms as possible.

So... to summarize, a 200 ohm trimmer and a 240 ohm fixed resistor would give you approximately, depending on tolerance, of 3.35v to 5.5v

Note, you mentioned replace the 200 ohm fixed resistor, did you mean pot? The fixed resistor will change both the high and low output range being it is always in the picture.