It is not reasonable to say that there are 250 blueberries in the carton because the average weight of the blueberry in the carton does not make sense. The average weight of the blueberry in the carton is 0.4 gram (=100/250) and the normal average weight of blueberry is 0.66 to 1.5 gram. This gross calculation has not yet included the carton's mass.