College students and surfers Rex Robinson and Sandy Hudson collected data on the self-reported number of days surfed in a month for 30 longboard surfers and 30 shortboard surfers.

Longboard: 10, 4, 15, 17, 4, 22, 8, 13, 10, 19, 8, 18, 4, 11, 21, 20, 21, 8, 8, 4, 10, 22, 5, 11, 12, 18, 20, 14, 10, 18.

Shortboard: 8, 9, 13, 17, 10, 9, 5, 7, 11, 11, 16, 16, 14, 4, 20, 14, 7, 5, 8, 20, 10, 12, 12, 15, 7, 9, 20, 14, 7, 5, 8, 20, 10, 12, 12, 15, 7, 9, 20, 7, 8, 8.

a. Compute the means for both longboards and shortboards

The mean for longboards is ??? days. (Round to one decimal places asneeded.)