Posted by **AmmanJordan** on Monday, May 6, 2013 at 7:15am.

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.Find E(S), SE(S), P(S=0)

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**FLu**, Monday, May 6, 2013 at 10:20am
E(S)= 0

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

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**Magnum**, Monday, May 6, 2013 at 10:57am
Thanks FLu!

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

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**AmmanJordan**, Monday, May 6, 2013 at 12:18pm
Thanks from me Flu

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**Bea**, Monday, May 6, 2013 at 12:50pm
Thanks, anyone for the rest?

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**Kingshuk**, Tuesday, May 7, 2013 at 2:46pm
Could anyone tell me the SE(S)?

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**Pebble**, Tuesday, May 7, 2013 at 3:16pm
SE(E)- 4.472

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**Kingshuk**, Wednesday, May 8, 2013 at 12:53am
Thanks Pebble.

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**Anonymous**, Wednesday, May 8, 2013 at 3:34am
Thanks Pebble, did someone solves or find the C....... P(S=0)?

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**Jabang**, Wednesday, May 8, 2013 at 12:51pm
1.0532687

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