Determine the average volume of solution P used, based on the provided burette readings.

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 solution P used.

Step