A true-false test consists of 20 questions, each of which has one correct answer: true, or false. One point is awarded for every correct answer, but one point is taken off for each wrong answer. Suppose a student answers every question by guessing at random, independently of other questions. Let S be the student’s score on the test. 1-Find E(S) 2-Find SE(S) 3-Find (no approximations, please) P(S=0)

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A true-false test consists of 20 questions, each of which has one correct answer: true, or false. One point is awarded for every correct answer, but one point is taken off for each wrong answer. Suppose a student answers every question by guessing at random, independently of other questions. Let S be the student’s score on the test. 1-Find E(S) 2-Find SE(S) 3-Find (no approximations, please) P(S=0)

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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so what is the probability that they get the first question right?
1/2
and just the next questions probability?

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can any one reply
can any one ans for 2nd question SE(S)
@CarlosGP Find SE(S)
Thanks @CarlosGP ur answer is right thanks
what does E(S) mean and SE(S) mean
Hi! E(S)=0 - correct SE(S)=4.4721359 - correct for P(S=0) - please to try "0.1762" - for this one i am not shure
0.1762 is correct answer.

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