A standardized exam’s scores are normally distributed. In a recent year, the mean test score was 1526 and the standard deviation was 313. The test scores of four students selected at random are 1920, 1250, 2250, and 1400. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 1920 is nothing. (Round to two decimal places as needed.) The z-score for 1250 is nothing. (Round to two decimal places as needed.) The z-score for 2250 is nothing. (Round to two decimal places as needed.) The z-score for 1400 is nothing. (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. A. The unusual value(s) is/are nothing. (Use a comma to separate answers as needed.) B. None of the values are unusual. Click to select your answer(s).
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