standardized exam's scores are normally distributed. In a recent year, the mean test score was 1506 and the standard deviation was 317. The test scores of four students selected at random are 1940, 1230, 2190, and 1400. Find the z-scores at correspond to each value and determine whether any of the values are unusual. he z-score for 1940 is. Round to two decimal places as needed.)

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