Through polymer synthesis, the individual linear chains rarely have the exact same degree of polymerization and molecular weight; there is always a distribution around an average value, which describes the relationship between the number of moles of each polymer species (Ni) and the molecular weight (Mi) of that species. Statistically, two definitions of molecular weight are used to compare different batches of polymers: Mn= number-average molecular weight MW= weight-average molecular weight MnMu=iNiiNiMi=iNiMiiNiMi2 Polydispersity index =Mw,Mn Calculate the Polydispersity Index (PDI) for a polymer sample that has five lengths of chains, characterized by the information in the table below