When you want to make a noncombat Trait roll for a group of Extras, roll one Trait die as usual along with a Wild Die. Take the better of the two as always and treat this as the group's total. This way you get a nice average without having to make individual Fear rolls for every Extra who sees a dragon, or watch one clumsy soldier ruin a stealthy approach for his 49 companions.
Savage Worlds Deluxe Edition p. 71