Statistics
posted by AmmanJordan on .
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.Find E(S), SE(S), P(S=0)

E(S)= 0
Anyone for SE(S) and P(S=0) ? 
Thanks FLu!
Anyone for SE(S) and P(S=0)? 
Thanks from me Flu

Thanks, anyone for the rest?

Could anyone tell me the SE(S)?

SE(E) 4.472

Thanks Pebble.

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

1.0532687