A School District Performed a Study to Find the Main

A school district performed a study to find the main causes leading to its students
dropping out of school. Thirty cases were analyzed, and a primary cause was assigned to
each case. The causes included unexcused absences (U), illness (I), family problems (F), and
other causes (O). The results for the thirty cases are listed below: $$\begin{array} { l l l l c l l l l l } \mathrm { U } & \mathrm { U } & \mathrm { U } & \mathrm { I } & \mathrm { F } & \mathrm { O } & \mathrm { O } & \mathrm { U } & \mathrm { I } & \mathrm { F } \\\mathrm { F } & \mathrm { O } & \mathrm { U } & \mathrm { I } & \mathrm { I } & \mathrm { F } & \mathrm { I } & \mathrm { I } & \mathrm { O } & \mathrm { U } \\\mathrm { I } & \mathrm { F } & \mathrm { F } & \mathrm { U } & \mathrm { U } & \mathrm { I } & \mathrm { I } & \mathrm { O } & \mathrm { F } & \mathrm { U }\end{array}$$
Construct a table summarizing the frequency distribution of the primary causes leading to student dropout.
$\begin{array}{l|l} \text { Cause } & \text { Frequency } \\ \hline \text { } & \text { } \\\end{array}$