The controller of Ivanhoe Industries has collected the following monthly cost data for use in analyzing the behavior of maintenance costs.

$\backslash$table$[[$Month$,\backslash$table$[[$Total$],[$Maintenance Costs$]],\backslash$table$[[$Total$],[$Machine Hours$]]],[$January$,$$$2,735,3,620],[$February$,3,108,4,144],[$March$,3,730,6,216],[$April$,4,334,8,184],[$May$,3,315,5,180],[$June$,4,603,8,290]]$