A 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.Find E(S)
Find SE(S)
Find (no approximations, please) P(S=0).

Question

A 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.Find E(S)
Find SE(S)
Find (no approximations, please) P(S=0).

anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

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anonymous · Answer

e(s)=0

anonymous · Answer

Find (no approximations, please) P(S=0)
0.176197

anonymous · Answer

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anonymous · Answer

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