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ok. [itex]\bar{n}=\sum_i n_i P_i[/itex]

do i use [itex]P_i[/itex] form the grand canonical distribution or from teh canonical distribution here? i was going to go with the former as the subsystem of volume V/3 is an open system i.e. it can exchange energy AND particles with the rest of the system - but i wanted to check??

for the variance, do i just use

[itex]\bar{\Delta n^2}= \bar{n^2} - \bar{n}^2[/itex]???

what would the graphs look like?

cheers