Find the midpoint of a line segment with the given endpoints $(3,1)$ and $(5,3)$. If necessary, round to the nearest tenth. a. $(7.5,2)$ b. $(4,2)$ c. $(6,1)$ d. $(8,7.3)$

Step 1 ：Given the endpoints of a line segment are (3,1) and (5,3).

Step 2 ：The formula to find the midpoint of a line segment with endpoints (x_1, y_1) and (x_2, y_2) is \(\left(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2}\right)\).

Step 3 ：Substitute the given points into the formula: midpoint = \(\left(\frac{3+5}{2}, \frac{1+3}{2}\right)\) = (4.0, 2.0).

Step 4 ：Final Answer: The midpoint of the line segment with endpoints (3,1) and (5,3) is \(\boxed{(4,2)}\).