Has a FIBA World Cup game ever ended 71-55?
Exactly once. On August 2, 1998, Russia beat Italy 71-55, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 71-55 in league history.
That makes 71-55 the 475th most common final score out of 1,178 that have ever occurred in FIBA World Cup. One point away, 72-55 has happened 1 times and 71-56 has happened never.