This production data was recorded during the last quarter of operations at Metal Company. Week Unit Produced Machine Hours 1 1,692 4,153 2 1,330 2,529 3 1,559 3,184 4 1,633 3,531 5 1,432 2,893 6 1,572 2,282 7 1,372 2,955 8 1,433 3,016 9 1,795 4,200 10 1,464 2,772 11 1,723 2,166 12 1,278 2,507 Required a) Plot machine hours versus units produced. b) Estimate the number of machine hours per unit of production using the high-low method.