Find the z-scores that correspond to each value.The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test scores are normally distributed. In a recent year, the mean test score was 21.1 and the standard deviation was 5.3. The test scores of four students selected at random are 15, 22, 9, and 35. (Source: ACT, Inc.)

x = 15 --> z =

x = 22 --> z =

x = 9 --> z =

x = 35 --> z =