I need help answering these questions

Assignment 8.1: Accuracy, Precision, and Uncertainty (continued) 7. A 1 kg object is weighed four times. The four readings are 1.005 kg, 0.998 kg, 0.995 kg, and 1.002 kg. (3 marks) a) Comment on the degree of precision of the measuring device used. b) Comment on the degree of accuracy of the measurements. c) What may cause the measurements to be inaccurate? 8. The accepted measurement for the density of aluminum is 2.70 g/cm3. After completing an experiment, Heath found the density of aluminum to be 2.76 g/cm3 + 0.06 g/cm. Is the accepted value for the density of aluminum within the range of uncertainty that Heath found? Explain why Heath may have received this result. (2 marks)