The damage values are per individual.
You can see this by comparing cards of the same type (Minions, Horde or Skeletons, Skarmy). They will show the same damage and health values, thus ignoring the amount of troops the card spawns.
Minion Horde Lv 13 = 123 dps
Minions Lv. 13 = 123 dps
Skeletons Lv. 13 = 98 dps
Skarmy Lv. 13 = 98 dps