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anonymous
 3 years ago
A truefalse 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.
1Find E(S)
2Find SE(S)
3Find (no approximations, please) P(S=0)
anonymous
 3 years ago
A truefalse 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. 1Find E(S) 2Find SE(S) 3Find (no approximations, please) P(S=0)

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FibonacciChick666
 3 years ago
Best ResponseYou've already chosen the best response.0so what is the probability that they get the first question right?

FibonacciChick666
 3 years ago
Best ResponseYou've already chosen the best response.0and just the next questions probability?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0can any one ans for 2nd question SE(S)

Nurali
 3 years ago
Best ResponseYou've already chosen the best response.1Thanks @CarlosGP ur answer is right thanks

dan815
 3 years ago
Best ResponseYou've already chosen the best response.0what does E(S) mean and SE(S) mean

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0Hi! 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

Nurali
 3 years ago
Best ResponseYou've already chosen the best response.10.1762 is correct answer.
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