I have an user, who received one score in 3 different things for example in A, B and C.
I want to get what average score received user for each thing. 1/3 = 0.33 so, this is fair distribution, but 0.33+0.33+0.33 is not 1.
May be give to A 0.34 score (suppose A is first thing and it has priority) and others 0.33, in this case sum will be 1, but this is a little unfair distribution.
Which case is better and logical in this situation? maybe you can offer some better solution?
$1/3 = 0.33$ is not true. $1/3 = 0.33333333333333333333\dots$
Simply set the average score recieved to $\frac13$ precisely, and then it will be fair.