Question 1 of 13 Quiz: Odds & Ends II
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An experiment  at Cornell University had complete strangers (that were experimenters) walk up to pedestrians on campus premises asking for directions. In the middle of the explanation, two men carrying a door passed them by, walking in between them; this was arranged by the experimenters. At this instance, the "stranger" having the dialogue switched over to carrying the door, to be replaced by a new person who continued taking directions.
How many of the 15 pedestrians who were approached for directions noticed a replacement had taken place?