The manager of a company that installs carpeting has tracked the installation crew's output over the past several weeks, obtaining the figures listed below. What is the average labor productivity of the best crew size?

$\backslash$table$[[$Week$,$Crew Size,$\backslash$table$[[$Sq Yards$],[$Installed$]]],[1,4,2,988],[2,3,2,283],[3,4,2,928],[4,2,1,486],[5,3,2,254],[6,2,1,490]]$