Suppose a multiple choice test contains 30 questions. If each question has 5 answer choices only one of which is correct, what is the expected number of questions to be answered correctly by guessing?...

Suppose a multiple choice test contains 30 questions. If each question has 5 answer choices only one of which is correct, what is the expected number of questions to be answered correctly by guessing?

The SAT used to penalize wrong answers by subtracting 1/4 a point from each incorrect answer. If each question on the SAT has 5 answer choices only one of which is correct, what is the expected number of points awarded by guessing on 30 questions?