A mcq question has 4 options.choosing correct option earns the student 3marks and the wrong answer incurs negetive marks so if a student choose an option randomly his expected score is zero.suppose a student has successfully eliminated two incorrect option.his expected score if he chooses randomly among the remaining option

• It will be 1 as total probablity is 0 suposse a negetive marks gives x marks
  therefore total probablity =>3*1/4+(x*1/4)+(x*1/4)+(x*1/4)=0
  therefore x=-1
  it indicates a negetive answer gives -1 marks
  now after eliminating 2 -ve ans the probablity is
  =>3*1/2+(-1*1/2)
  = 1
• 13 years agoHelpfull: Yes(2) No(2)