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That's 800 million fewer than a previous estimate suggested.
Largest prehistoric animals - Wikiwand
Insufficient Evidence To Support Trio Of T. Rex Species Theory, Say Scientists
XXL Tyrannosaurus Rex Skull
How many T. rexes were there? Billions.
Dinosaur world presentation
Tyrannosaurus rex, Prehistoric Planet Wiki
The World of Dinosaurs
Allosaurus vs T-Rex: Who Would Win the Battle? - Gage Beasley Prehistoric
Tyrannosaurids Classification & Types
Dinosaurs May Be Extinct, but They Look Extremely Lifelike in Rehovot - Haaretz Com
What is the evidence for and against the claim that T-Rexes were scavengers? - Quora