A quiz has 50 multiple choice questions. Each question has 3 possible answers, one of which is correct. A correct answer is worth 2 points, but a point is taken off for each incorrect answer. A student answers all 25 questions by guessing at random. In each case present the problem with an appropriate box model. Find the expected value and the standard error for the sum of 25 draws. Interpret this sum in terms of the scores.