Answers to a Questionnaire Were in the Following Sequence

Essay

Answers to a questionnaire were in the following sequence. Test for randomness.
$\begin{array} { l l l l l l l l l l } \mathrm { Y } & \mathrm { Y } & \mathrm { N } & \mathrm { Y } & \mathrm { N } & \mathrm { N } & \mathrm { N } & \mathrm { N } & \mathrm { Y } & \mathrm { Y } \\N & N & N & N & Y & Y & Y & N & N & N \end{array}$