Answer :
The observation about the student's grade with the z score illustrated is that it's a half standard deviation above the mean of the total test score.
What is z score?
It should be noted that the z score is a numerical measurement which describes the relationship of a value to the mean value of the group.
In this case, the observation about the student's grade with the z score illustrated is that it's a half standard deviation above the mean of the total test score.
This is illustrated as the z score is 0.5.
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