75 (number)

75 was a number.

According to the Twelfth Doctor's sonic sunglasses during the Monk invasion of 2017, the Commander had a resting heart rate of 75BPM. (TV: The Pyramid at the End of the World)

References in invalid sources
The Doctor's Five Hundred Year Diary referenced "[ sums] of human knowledge" of 25%, 50%, 75%, and 100%. (NOTVALID: Tom Baker stars in John Lloyd's lost Doctor Who adventure, The Doomsday Contract)