Solution: First, evaluate the boundary values. \(\frac52 = 2.5\). Since \(\pi \approx 3.1416\), we have \(3\pi \approx 9.4248\). We seek whole numbers \(n\) such that \(2.5 < n < 9.4248\). These are \(3, 4, 5, 6, 7, 8, 9\). Counting them, there are 7 whole numbers. Therefore, the answer is \(\boxed7\). - Groen Casting