A standardized exam's scores are normally distributed. In a recent year, the mean test score was and the standard deviation was . The test scores of four students selected at random are , , , and . Find the z-scores that correspond to each value and determine whether any of the values are unusual.

The following are the solution to this question:

Step-by-step explanation:

In the given question, some of the values are missing which is defined in the attached file please find it.

In this question, the data is used to represent a standardized exam's scores, which is normally spread out into the test score that is  1530 and its standard deviation 316.  

Formula:

If the value of z-score= 1930

The z-score is 1.27

If the value of z-score= 1250

The z-score is -0.886

If the value of z-score= 2250

The z-score is = 2.27

If the value of z-score= 1420

The z-score is = -0.348

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step-by-step explanation:

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step-by-step explanation: