Calculate the average volume of H2SO4 used in the titration, given the hypothetical burette readings.

Since no experimental data is provided, we will assume hypothetical burette readings for solution A ($H_2SO_4$) to demonstrate the tabulation and calculation of the average volume. We will also assume a 25 cm³ portion of solution B (XOH) was used for each titration.

$$\begin{array}{|c|c|c|c|} \hline \textbf{Titration} & \textbf{Initial Burette Reading (cm³)} & \textbf{Final Burette Reading (cm³)} & \textbf{Volume of A used (cm³)} \\ \hline \text{Rough} & 0.00 & 24.50 & 24.50 \\ \text{1} & 0.00 & 24.30 & 24.30 \\ \text{2} & 0.00 & 24.40 & 24.40 \\ \hline \end{array}$$

Concordant titres are those that are within $\pm 0.10 \text{ cm}^3$ of each other. From the hypothetical data, the concordant titres are $24.30 \text{ cm}^3$ and $24.40 \text{ cm}^3$.

$$\text{Average volume of A} = \frac{\text{Sum of concordant volumes}}{\text{Number of concordant volumes}}$$ $$\text{Average volume of A} = \frac{24.30 \text{ cm}^3 + 24.40 \text{ cm}^3}{2}$$ $$\text{Average volume of A} = \frac{48.70 \text{ cm}^3}{2}$$ $$\text{Average volume of A} = \boxed{\text{24.35 cm}^3}$$