Exclusive mean

Tourist has given you an array of size $n$. He allowed you to modify the array in the following way, in one operation you can swap any two elements of the array. Formally, a swap means you can choose two indices $i,j$ $1 \leq i,j \leq n$ (indexing starts from $1$) and exchange the values of $a_i$ and $a_j$ He is greedy and likes smaller numbers, so he wants you to minimize the Exclusive Mean