Step 1 :Given a cylindrical jar with diameter 4 in and height 5 in, first find the radius: \(r = \frac{d}{2} = \frac{4}{2} = 2\) in
Step 2 :Next, calculate the volume using the formula: \(V = \pi r^2 h = \pi (2)^2 (5) = 20\pi \approx 62.83\) in^3
Step 3 :\(\boxed{\text{Final Answer: The actual volume of the cylindrical jar is approximately 62.83 cubic inches}}\)