SOLUTION: A exam has 20 multiple choice questions( each had four choices: a,b,c,d) and 10 true false questions. Suppose a student used random guessing and all questions are answered. Assumin

Question 549977: A exam has 20 multiple choice questions( each had four choices: a,b,c,d) and 10 true false questions. Suppose a student used random guessing and all questions are answered. Assuming each multiple choice questions is worth 2 points and true false worth 1 point. What is the expected value and the variance of the exam score?
Answer by nasa(3) (Show Source): You can put this solution on YOUR website!
well first your grade makes a difference to this answer but the test is worth 50 points.

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