MEANS, ARITHMETIC, GEOMETRIC, HARMONIC
Equations
Arithmetic Mean=(Rf1+Rf2+Rf3....Rfn/)n
Geometric Mean=(Rf1.Rf2.Rf3.....Rfn)
1/n
Harmonic Mean=n/((1/Rf1)+(1/Rf2)+(1/Rf3) 1/ Rfn)