A standardized exam's scores are normally distributed. In a recent year, the mean test score was 20.9 and the standard deviation was 5.7. The test scores of four students selected at random are 13, 21, 9, and 35. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 13 is. (Round to two decimal places as needed.)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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A standardized exam's scores are normally distributed. In a recent year, the mean test score was 20.9 and the standard deviation was 5.7. The test scores of four students selected at random are 13, 21, 9, and 35. Find the z-scores that
correspond to each value and determine whether any of the values are unusual.
The z-score for 13 is.
(Round to two decimal places as needed.)
Transcribed Image Text:A standardized exam's scores are normally distributed. In a recent year, the mean test score was 20.9 and the standard deviation was 5.7. The test scores of four students selected at random are 13, 21, 9, and 35. Find the z-scores that correspond to each value and determine whether any of the values are unusual. The z-score for 13 is. (Round to two decimal places as needed.)
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