A regression was run to determine if there is a relationship between hours of TV watched per day $(x)$ and number of situps a person can do $(y)$.
The results of the regression were:
\[
\begin{array}{l}
y=a x+b \\
a=-1.082 \\
b=32.931 \\
r^{2}=0.5625 \\
r=-0.75
\end{array}
\]
Use this to predict the number of situps a person who watches 7.5 hour(s) of TV can do, and please round your answer to a whole number.

Step 1 ：The problem provides a regression equation in the form \(y = ax + b\), where \(y\) is the number of situps a person can do, \(x\) is the number of hours of TV watched, \(a\) is the slope of the line, and \(b\) is the y-intercept.

Step 2 ：The given values are \(a = -1.082\), \(b = 32.931\), and \(x = 7.5\).

Step 3 ：To predict the number of situps for a person who watches 7.5 hours of TV, we substitute \(x = 7.5\) into the equation and solve for \(y\).

Step 4 ：Substituting the values into the equation gives \(y = -1.082 * 7.5 + 32.931\).

Step 5 ：Solving the equation gives \(y = 25\).

Step 6 ：Final Answer: The predicted number of situps a person who watches 7.5 hours of TV can do is \(\boxed{25}\).