This Test: 19 pts possible This Question: 1 pt 16 of 19 (7complete) 96 the mean

Question

This Test: 19 pts possible This Question: 1 pt 16 of 19 (7complete) 96 the mean test score was 1528 and the standard deviation was 315. The test scores of four students and determine whether any of the values are sA standardized exam's scores are normally distributed. In a recent year, score was 1 selected at random are 1950, 1260, 2230, and 1430. Find the z-scores that correspond to each value a ome The z-score for 1950 is Round to two decimal places as needed.) The Hare for t260 is VideOS| Book ork Round to two deaimal places as needed.) The z-soore for 2230 is Round to two deaimal places as needed The z-soore for 1430 is Round to two decimal places as needed.) Which values, #any, are unusual? Select the correct choice below and, if necessary, fil in the answer box within your choice O A. The unusual values) are 6 ons ook (Use a comma to separate answers as needed.) unch or Succe e Tools Click to select your answers).

Explanation / Answer

An event is unusual if the z score is less than -2 or greater than 2

z score = (x - mean)/standard deviation

The z score for 1950 is (1950 - 1528)/315 = 1.34

The z score for 1260 is (1260 - 1528)/315 = -0.85

The z score for 2230 is (2230 - 1528)/315 = 2.23

The z score for 1430 is (1430 - 1528)/315 = -0.31

A. The unusual value is 2230

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