Normally distributed.
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For "testing outcomes" synonyms can include scores, grades, placements, or marks.
When a student takes a test or examination the result they receive, as a number, is often called a score. The average of a collection of scores, say for one class of students, is called a mean score. Mean is just another word for average.
You can't do this without knowing the distribution of scores.
They should be.
the sum of the scores divided by the number of scores submitted