The Minnesota area has the following weather in $^{\circ}F$ . What is the difference between the high temperature average and the low temperature average over the three days ?

Question

$\begin{array}{1 1} (a)\;20^{\circ}F\\ (b)\;23^{\circ}F \\ (c)\;25^{\circ}F \\(d)\;27^{\circ}F \end{array} $