In a particular year, the mean score on the ACT test was 20.6 and the standard deviation was 4.3. The mean score on the SAT mathematics test was 530 and the standard deviation was 125. The distributions of both scores were approximately bell-shaped. Round the answers to at least two decimal places. Part: 0 / 40 of 4 Parts Complete Part 1 of 4 (a) Find the z-score for an ACT score of 23. The z-score for an ACT score of 23 is .