Level range of pubblished 5e campaigns:
starter set: 1-5
hoard of the dragon queen: 1-7
the rise of tiamat: 8-15 (second part of hoard)
elemental evil: 1-15
rage of demons: 1-15
curse of strahd: 1-10
Storm King's Thunder: 1-11
tales of the yawing portal: 1-14
Tomb of Annihilation 1-11
Waterdeep dragon heist: 1-5
waterdeep dungeon of the mad mage 5-20
Ghosts of Saltmarsh 1-12
Baldur's Gate: Descent into Avernus 1-13
only 10% of D&D player actually play above lvl 10.
the 0% levels–these aren’t levels with nobody making characters in them, just that they’re statistically insignificant out of the hundreds of thousands of characters they sifted through to mine all the data.