Josiah participates in a bowling league each summer and again each autumn. In Summer 2019, his mean score for the year was 145. For the whole league, the mean score was 152 with a standard deviation of 9. For Autumn 2019, his mean score was 156. The mean for the entire Autumn league was 161 with a standard deviation of 4. In which league (summer or autumn) did Josiah perform better?