The turning moment diagram for a quadruple expansion marine engine drawn to the following scales: 1 cm = 15 ton-m and 1 cm = 150. The areas of the loops above and below the mean turning moment line taken in order are 0.12, 0.34, 0.91, 0.81, 0.15, 0.18, 1.86 and 1.71 cm2. If the moment of inertia of the propeller and entrained water is 100 ton-m2 and the mean speed of rotation is 100 r.p.m., what is the value of the coefficient or fluctuation of speed?