Question

a standardized exams scores are normally distributed. in a recent year, the mean test score was 1474 and the standard deviation was 316. the test scores of four students selected at random are 1880, 1200, 2220, and 1360. find the z - scores that correspond to each value and determine whether any of the values are unusual. the z - score for 1880 is 1.29 (round to two decimal places as needed.) the z - score for 1200 is - 0.87 (round to two decimal places as needed.) the z - score for 2220 is 2.36 (round to two decimal places as needed.) the z - score for 1360 is - 0.36 (round to two decimal places as needed.) which values (test scores), if any, are unusual? if there are no unusual values then type b. a. the unusual value(s) is/are 2220 (use a comma to separate answers as needed.) b. none of the values are unusual

Explanation:

Answer:

The z - score for 1880 is \(1.29\)
The z - score for 1200 is \(-0.87\)
The z - score for 2220 is \(2.36\)
The z - score for 1360 is \(-0.36\)
A. The unusual value(s) is/are \(2220\)