A student measures the mass and determines the volume of a cubic object to determine its density. The student recorded a set of data; 2.86 cm, 2.79 cm and 2.82 cm. He massed the object and recorded 23.7 g. The actual density of the object is 0.987 g/cm^3. What is the percent error made by the student? (Enter the answer to three significant figures. Then enter a space and then enter the symbol.)