RRB ALP 2018 Normalization Process of Marks (PDF)



RRB ALP CEN 01/2018 Normalization of Marks in CBT2 : A Scientific and Statistical Process (PDF)



RRB examinations attract exceptionally large number of candidates. In order to conduct examination for such a large number of candidates, examination has to be held in multiple sessions. Accordingly, 2nd stage CBT was held in 10 sessions. CBT Marks are normalized in all the stages of exam and the instructions in this regard have been clearly mentioned in para 6 of CEN 01/2018.



When an examination is conducted in multiple sessions for the same syllabus, in spite of all efforts there are chances of variation in the difficulty level of the questions in various sessions. Thus the score obtained by the candidates of same calibre is likely to vary. In order to equalize the variation in the difficulty level of question papers a process called statistical normalization of marks is resorted to universally. This ensures level playing field for all the candidates.



Normalization process followed by RRBs is a scientific and statistical process. It is not a process of awarding grace marks. 



The normalisation formula used by RRBs is as under: 

Xn= (S2/S1) (X-Xav) + Yav 

Where : 

Xn= Normalised Score of a Candidate 
S2— Standard Deviation of raw marks of Base Session 
S1= Standard Deviation of raw marks of Candidate Session 
X= Raw marks of candidate which is to be normalized 
Xav= Average of raw marks of Candidate Session 
Yav= Average of raw marks of Base Session 

Base Session is a Session having highest average among all the Sessions of an exam with a condition that its population should be 70% or more than the average of all Session.













RRB ALP 2018 Normalization Process of Marks (PDF) RRB ALP 2018 Normalization Process of Marks (PDF) Reviewed by Avinash Kumar on 4/27/2019 07:04:00 pm Rating: 5

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