The Following Table Shows the Relationship Between Pressure (In Atmospheres) $\circ$

The following table shows the relationship between pressure (in atmospheres) and volume (in liters) of hydrogen gas at 0 ^$\circ$ C.
$\begin{array} { | l | c | c | c | c | c | c | } \hline \text { Pressure (atm) } & 1 & 2 & 3 & 4 & 5 & 6 \\\hline \text { Volume (L) } & 22.4 & 11.2 & 7.5 & 5.6 & 4.5 & 3.7 \\\hline\end{array}$
(a) Find the average rate of change of volume with respect to pressure for the following pressure intervals:
(i) [3, 5]
(ii) [3, 4]
(iii) [2, 3]
(b) Estimate the rate of change of volume with respect to pressure if the pressure is 2 atmospheres.