Question: An edX assignment has 50 multiple-choice questions, each with four choices of which one is correct. A student gets 3 points for solving a question

An edX assignment has 50 multiple-choice questions, each with four choices

An edX assignment has 50 multiple-choice questions, each with four choices of which one is correct. A student gets 3 points for solving a question correctly, and loses a point for an incorrect answer. What is the expected score of a student who answers all questions uniformly at random

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