(Solved): Consider an MCQ-type exam with a total of 10 problems. Each problem has a tot ...

???????

Consider an MCQ-type exam with a total of 10 problems. Each problem has a total of 4 choices, only one of which is correct. When deciding on the grading scheme, an instructor decides to award \( +4 \) points for every correct answer. But to discourage students from making random choices, the instructor also decides on instituting negative scoring. How many points should the instructor deduct for every wrong answer so that the average score of a student making completely random choices is zero?