QUESTION ABOUT SCORE

QUESTION ABOUT SCORE

Hi, 

I designed a survey and I´m working with the Ranking option.   I have my graph and results table and I need interpret my results,   I want to know what is the mean of SCORE? : 

example

SCORE     RANK    RESPONSE COUNT,
  4.09             1                    54
  3.07             2                    54
  2.83             3                    54
   2.8              4                    54
   2.2              5                    54


What does the score column?
I really appreciate your help,
Thank you so much,
Abril MG