Many Minions in the MM are wrong:
Cyclops Guard: Level 14, half level modifier on ability scores is +5
Abyssal Ghoul Myrmidon: level 23, abilities modifier +10
Hobgoblin Grunt: level 3, abilities +0
Hobgoblin Warrior: level 8, abilities +3
Grimlock Minion: level 14, abilities +5
Grimlock Follower: level 22, abilities +8
Human Rabble: level 2, abilities +0
Kruthik Hatchling: level 2, abilities +0
Orc Drudge: level 4, abilities +0
Orc Warrior: level 9, abilities +3
Troglodyte Warrior: level 12, abilities +5
Vampire Spawn Fleshripper: level 5, abilities +3
Yuan-ti Snaketongue Zealot: level 12, abilities +5
Zombie Rotter: level 3, abilities +0
Some of these (Human Rabble, Zombie Rotter, Kruthik Hatchling, Hobgoblin Grunt, Vampire Spawn) are also in KotS, Orcs are the same as excerpt - all including the errors.
I just hope their defenses are the right numbers.
Math Errors are worse now, because the math should work.