A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1456 and the standard deviation was 319. The test scores of four students selected at random are 1870, and 1200 . Find the z-scores that correspond to each value. The z-score for 1870 is (Round to two decimal places as needed.) The z-score for 1200 is (Round to two decimal places as needed.)