The controller of Oriole Industries has collected the following monthly expense data for analyzing the cost behavior of electricity costs. Total Electricity Costs Total Machine Hours January $1,890 280 February 2,980 360 March 3,500. 500 April 4,510 690 May 3,240 400 June 4,860 790 July 4,140 650 August 3,830 540 September 5,090 665 October 4,310 605 November 3,400 360 December 6,160 810