mean_n(a) = ( 1/n ) * ( (n-1) * mean_n_1 + a )

where mean_n is mean of all numbers till a.

mean_n_1 is mean of all numbers except a.

Now if the n is big then it can be approximated to: mean_n_1 + a/n.

The interesting part is (a/n). If

where mean_n is mean of all numbers till a.

mean_n_1 is mean of all numbers except a.

Now if the n is big then it can be approximated to: mean_n_1 + a/n.

The interesting part is (a/n). If

**a**wants to participate in the mean calculation then it just needs to be divided into n portions and added to the previous mean(for n-1).
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