Final answer:
The actual length of a table measured to be 604 mm is between 603.5 mm and 604.5 mm, these values representing lower and upper bounds of the measurement rounded to the nearest millimeter.
Step-by-step explanation:
When a table length is measured to be 604 mm, rounded to the nearest millimeter, the actual length of the table lies within certain bounds. This range is determined by considering the precision of the measurement tool—in this case, a meter stick which can measure to the nearest millimeter. Since the length is rounded to the nearest millimeter, the lower bound would be 603.5 mm (just less than 604 mm, as it would round up), and the upper bound would be 604.5 mm (just above 604 mm, as it would round down). So, the bounds for the actual length of the table are 603.5 mm to 604.5 mm.