Question

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)

Answers

FLu
E(S)= 0

Anyone for SE(S) and P(S=0) ?
Magnum
Thanks FLu!
Anyone for SE(S) and P(S=0)?
AmmanJordan
Thanks from me Flu
Bea
Thanks, anyone for the rest?
Kingshuk
Could anyone tell me the SE(S)?
Pebble
SE(E)- 4.472
Kingshuk
Thanks Pebble.
Anonymous
Thanks Pebble, did someone solves or find the C....... P(S=0)?
Jabang
1.0532687

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