The statement is - False.
The Manchurian Plain is one of the best places for living in China, in accordance to geography. Most of China's population is in the eastern part of the country, with the most densely populated being the North China Plain in the central eastern part of the country. Even though the Manchurian Plain is densely populated, and has a very big population, still it does not have that big of a population that would account for around one tenth of the world's population.