They cannot. Test scores are either marks or percentages based on marks (out of the total) and so are discrete.
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Discrete.
The answer depends on what the experiment is about. For example, if you believe (or want to test) that pupils' scores in English tests depend on their scores in maths tests, then the independent variable is the maths score. But if you believe that the English scores influence their maths scores then the independent variable is the maths score.
The average score on an IQ test is about 100. If you score higher than that, your score will be above average.
The independent (or explanatory) variable is changed to test the prediction,
z score = (test score - mean score)/SD z score = (87-81.1)/11.06z score = 5.9/11.06z score = .533You can use a z-score chart to calculate the probability from there.