A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1484 and the standard deviation was 316. The test scores of four students selected at random are 1930, 1220, 2170, and 1370. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1930 is. (Round to two decimal places as needed.) The z-score for 1220 is. (Round to two decimal places as needed.) The z-score for 2170 is. (Round to two decimal places as needed.) The z-score for 1370 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.)

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