A Survey of Some AP* Stats Students Recorded Gender and Whether

Multiple Choice

A survey of some AP* Stats students recorded gender and whether the student was left or right-handed. Results were summarized in a table like the one shown. If it turned out that handedness was independent of gender, how many of the AP* Stats students were lefty girls? $\begin{array}{|c|c|c|c|}\hline& \text { Lefty } & \text { Righty } & \text { Total } \\\hline \text { Boy } & & & 66 \\\hline \text { Girl } & ? & & 54 \\\hline \text { Total } & 20 & 100 & 120 \\\hline\end{array}$

A) 4
B) 9
C) It cannot be determined.
D) 10
E) 7