Answer
${{7}^{\circ }}\text{F}$
Work Step by Step
Consider the given table.
From the table, the temperature at a wind speed of $10\,\text{mph}$for air temperature ${{15}^{\circ }}\text{F}$is ${{3}^{\circ }}\text{F}$.
And, the temperature at a wind speed of $25\,\text{mph}$for air temperature ${{15}^{\circ }}\text{F}$is $-{{4}^{\circ }}\text{F}$.
Difference between the temperatures is,
$\begin{align}
& \text{diff}=3-\left( -4 \right) \\
& =3+4 \\
& =7
\end{align}$
