A Shoe Retailer Keeps Track of All Types of Information

Multiple Choice

A shoe retailer keeps track of all types of information about sales of newly released shoe styles. One newly released style was marketed to tall people. Listed below are the shoe sizes of 12
Randomly selected customers who purchased the new style. Find the mode of the shoe sizes.
$\begin{array} { c c c c } 9 \frac { 1 } { 2 } & 11 & 12 & 11 \frac { 1 } { 2 } \\8 \frac { 1 } { 2 } & 10 \frac { 1 } { 2 } & 8 & 11 \\10 & 11 & 9 \frac { 1 } { 2 } & 10\end{array}$

A) 11
B) $10 \frac { 1 } { 4 }$
C) $9 \frac { 1 } { 2 }$
D) $10 \frac { 1 } { 2 }$