The average value of ＄$$2$$, ＄$$4$$, ＄$$6$$, ＄$$8$$, and ＄$$10$$ is~\uline{~~~~~~~~~~}~pennies. 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
Average $$=$$(＄$$2+$$＄$$4+$$＄$$6+$$＄$$8+$$＄$$10$$)$$\div 5=$$＄$$6=600$$ pennies. 