A central area for "Giant" fish farming has received extension assistance and business loan funds from the government. In the selected group that received assistance, the total productivity growth (quintal) per farmer was observed for 8 times of observations starting on the 10th day. Help the extension agent in the group about the following: The technique of measuring the total productivity of each farmer on each observation day Average formula ( ):   = _ (i = 1) ^ nXi / n How to measure the diversity of farmers' abilities in "Giant" fish farming If there is diversity in the ability of farmers to cultivate "Giant" fish, determine the best and worst breeders from the group. If the harvest will be done on the 60th day can you estimate the total productivity of the group's fish at harvest (graphic form)!