Which type of planet is denser - rocky planets (Mars, Earth, etc) or dwarf planets (Pluto, Eris, etc)

The terrestrial planets have twice or more the density the dwarf planets in the following tables. However, most of them are about twice as dense as liquid water, so that means there has be rock core. Pluto is NOT a comet.

http://www.windows2universe.org/our_sola…

http://nssdc.gsfc.nasa.gov/planetary/fac…

http://nssdc.gsfc.nasa.gov/planetary/fac…