The mass of an object was recorded as 9.93 g 9.90 g and 10.02 g using an electronic analytic balance. What is the average of these three masses expressed to the correct number of significant figures?

To find the average of the three masses (9.93 g, 9.90 g, and 10.02 g), first sum the values: 9.93 + 9.90 + 10.02 = 29.85 g. Next, divide by the number of measurements: 29.85 g / 3 = 9.95 g. Since the least precise measurement (9.90 g) has three significant figures, the average should also be expressed to three significant figures, resulting in an average mass of 9.95 g.