A Marine Ecologist Counts the Number of Octopuses in Three

A marine ecologist counts the number of octopuses in three different intertidal regions that each measure 2 hectares. The octopus counts are 7, 2, and 6 respectively. What is the BEST estimate of population density for this particular species of octopus?

A) 2
B) 6
C) 7
D) 5
E) More sampling would have to be done until two areas have the same count.