Determine the average volume of solution P used.

Here are the solutions to the questions based on the provided image and previous context.

First, let's complete the table and calculate the average volume of solution P used.

Table II:

	I	II	III
Final burette reading ($\text{cm}^3$)	7.2	14.5	21.9
Initial burette reading ($\text{cm}^3$)	0.0	7.2	14.5
Volume of solution P used ($\text{cm}^3$)	7.2	7.3	7.4

a) Determine the average volume of