Chapter 2.3B, Problem 18A

A pollster interviewed $600$ university seniors who owned credit cards. She reported that owned $290$ owned Goldcard, $300$ had supercard, and $270$ had Thrifcard. Of those seniors the report said that $80$ owned only a Goldcard and a Supercard, $70$ owned only a Goldcard and Thriftcard, $60$ owned only a Supercard and a Thrifcard, and $50$ owned all three cards. When the report was submitted for publication in the local campus newspaper, the editor refused to publish it, claming the poll was not accurate. Was the editor right? Why or why not?