In a study of high school hockey that suffered concussions, researchers placed the players in two groups. Players that recovered from their concussions in 14 days or less were placed in Group 1. Those that took more than 14 days were placed in Group 2. The recovery times (in days) for Group 1 are listed below.

Find the sample variance of the recovery times.

4 7 6 7 9 5 8 10 9 8 7 10

(Round to one decimal)