(10 points) A professor gave an exam with 10 questions. After nishing grading the professor wrote down the number of correct answers for each student.
(10 points) A professor gave an exam with 10 questions. After nishing grading the professor wrote down the number of correct answers for each student. No partial credit was given. The average number of right answers was 6.7 with an SD (Standard Deviation) of 2.1. What is the correlation between the number of correct answers and the number of wrong answers
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