$6-2.($Appendix $6$A$)$ Data on a weck's activity in the shipping department of Com, inci are given Below:

a$.$ Using the least squares method, determine the variable cost per unit shipped:

$b=\frac{n({\displaystyle \underset{?}{\overset{?}{}}}xy)-({\displaystyle \underset{?}{\overset{?}{}}}x)({\displaystyle \underset{?}{\overset{?}{}}}x)}{n({\displaystyle \underset{?}{\overset{?}{}}}{x}^2)*({\displaystyle \underset{?}{\overset{?}{}}}x{)}^2}$

Chapter $6$

$\backslash$table$[[$Units$,$Shipping,,$],[\backslash$table$[[$Shipped$],[($X$)]],($C$),\backslash$table$[[$WY$],[6940]],144],[12,$& $580,\backslash$table$[[56,903],[11,135]],229],[\backslash$table$[[17],[10]],655,5,500,100],[\backslash$table$[[10],[7]],\backslash$table$[[550],[505]],3,535,49],[7,\backslash$table$[[505],[535]],4,815,81],[9,475,2\mathrm{.}375,\frac{25}{25}$