Calculate the number-average and weight-average molecular weights and polydispersity index for a sample of this nylon made by blending four separate fractions, each of which has the following narrow m. w. distributions: (use accurate atomic weights, watch sig. figs in your final answer  but hold onto a few extra values throughout the calculation)sample dpweight blended (g)1 62.4145.02 98.5210.03 139274.04 203292.0