The masses of four sugar cubes are measured to be 25.3 g, 24.7 g, 26.0 g, and

Question:

The masses of four sugar cubes are measured to be 25.3 g, 24.7 g, 26.0 g, and 25.8 g. Express the answers to the following questions in scientific notation, with standard SI units and an appropriate number of significant figures.
a) If the four sugar cubes were crushed and all the sugar collected, what would be the total mass, in kilograms, of the sugar?
b) What is the average mass, in kilograms, of these four sugar cubes?