A standardized exam score are normally distributed. In a recent year, the mean test score was 1473 and the standard deviation was 317. The test score of for students selected at a random are 1910, 1190, 2220 and 1380. Find the z-score that correspond to each value and determine whether any of the values are unusal.

Z Score for 1910 is ___

Z Score for 1190 is ____

Z score for 2220 is _____

Z score is 1380 ____

Which values if any, are unusual?