The three friends and the stranger, even though the stranger didn't have any extra information, even though it was just a case of how that changed the conversation to accommodate that awkwardness, the three friends and the stranger, they had a 75 percent chance of finding the right answer.
３人と知らない１人のグループは その１人が何か追加情報を持っていた わけでもないのに そこに他人がいるという 気まずさを補うために 会話に変化が起きただけなのに ３人と知らない１人のグループは 正解率75％でした