or 21.4 average nationwide score is 21 average nationwide score is 21 average ACT composite score the average composite ACT score was 21 or 21.4 or 21.4 PrepScholar PrepScholar average nationwide score is 21 average nationwide score is 21 PrepScholar or 21.4 the average composite ACT score was 21 the average composite ACT score was 21 In 2014 the average composite ACT score was 21