Statistics

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¬Ęs score on the test.Find E(S), SE(S), P(S=0)

asked by AmmanJordan
  1. E(S)= 0

    Anyone for SE(S) and P(S=0) ?

    posted by FLu
  2. Thanks FLu!
    Anyone for SE(S) and P(S=0)?

    posted by Magnum
  3. Thanks from me Flu

    posted by AmmanJordan
  4. Thanks, anyone for the rest?

    posted by Bea
  5. Could anyone tell me the SE(S)?

    posted by Kingshuk
  6. SE(E)- 4.472

    posted by Pebble
  7. Thanks Pebble.

    posted by Kingshuk
  8. Thanks Pebble, did someone solves or find the C....... P(S=0)?

    posted by Anonymous
  9. 1.0532687

    posted by Jabang

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