I personally refigure the average eliminating the highest and lowest bid when they go out of wack with the rest. I think that is probably a little better than the median. Median will probably often give similar results, but not a lot of the time.
(esconder) Mantenha a sua Caixa de Mensagens limpa, Arquivando mensagens importantes e usando regularmente a opção "Apagar TODAS as Mensagens". (pauloaguia) (mostrar todas as dicas)