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pakinam

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)

  • 11 months ago
  • 11 months ago

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  1. FibonacciChick666
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    so what is the probability that they get the first question right?

    • 11 months ago
  2. JULIAKAPRI
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    1/2

    • 11 months ago
  3. FibonacciChick666
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    and just the next questions probability?

    • 11 months ago
  4. dinakar
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    can any one reply

    • 11 months ago
  5. dinakar
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    can any one ans for 2nd question SE(S)

    • 11 months ago
  6. Nurali
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    @CarlosGP Find SE(S)

    • 11 months ago
  7. Nurali
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    Thanks @CarlosGP ur answer is right thanks

    • 11 months ago
  8. dan815
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    what does E(S) mean and SE(S) mean

    • 11 months ago
  9. Oles
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    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

    • 11 months ago
  10. Nurali
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    0.1762 is correct answer.

    • 11 months ago
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