A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1499 and the standard deviation was 311. The test scores of four students selected at random are 1920, 1260, 2170, and 1380. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1920 is (Round to two decimal places as needed.) The z-score for 1260 is (Round to two decimal places as needed.) The z-score for 2170 is (Round to two decimal places as needed.) The 2-score for 1380 is. (Round to two decimal places as needed.) Which values, if any, are unusual? Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The unusual value(s) is/are (Use a comma to separate answers as needed.) O B. None of the values are unusual. Next