On this number line, the mid-point is 6,000. The arrow is not exactly half way between 5,000 and 10,000. It is a little bit closer to 10,000. But it is not extremely close to 10,000.
Translated to English, “Manpo” literally means “10,000 steps,” and it's thought that number was chosen because the Japanese character for the number 10,000 resembles a person walking.