几何均数计算 例25:例数合计f=69 ∑fgx=150.2778 fIg X 50.2778 XG=Ig 1=lg 69 lg(2.1779)=150.6x=280.86 结论:69例RA患者血清EBⅤlgG抗体平均滴 度为1:1506几何均数计算 • 例2-5 ：例数合计 • lg (2.1779) 150.6 ) 69 150.2778 ) lg ( lg lg ( 1 1 1 = = =   = − − − f f X X i G 结论：69例RA患者血清EBV-lgG抗体平均滴 度为1：150.6 f = 69 f lg x =150.2778 x = 280.86