It depends on the receiver. All players in the NFL, including wide receivers, are paid differently.
200 pounds on average
I just calculated the average height for WRs drafted in 2008 and got 73.2 inches, so 6'1". I would venture an educated guess at 6'0" to be the average height of current NFL receivers.
Wide Receivers range from 185-225 lbs.
After doing all the research, from what I can tell the average height and weight of an NFL wide receiver its apprmox. 6'2 and roughly 205lbs.
There must be a minimum of four receivers, but most teams get five because of the dime formation, which has five receivers.