Dear Andy,
This is very very very false,

Sorry to quote irreliable sources :
http://en.wikipedia.org/wiki/Median

The median(s) is/are the values defined as :
For a population, a median is a value such as:
"At most half the population have values less than the median and at most half have values greater than the median."

Typically for a populations, represented by the values of their members,

1 2 3 4 5 -> median=3

1 2 3 4 -> median=2 and median=4

room of 12 people with 30k$ income + bill gates
median = 30k

Best, Ben