Um...I don't know how to figure that out? It was a small feeder rat that I got from the pet store. I assume they're weaned since they keep them in large cages with many other rats labeled as feeders.
Well if it was weaned and you offered food and water and it died I would question the health of the feeder itself and the source, rats are pretty easy food, water, well ventilated enclosure that's all they really need.