\normalsize \begin{eqnarray} P(Y = 0) \ &=& \ P(\mbox{no females} ) \\ \vspace{5} \\ &=& \ P(\mbox{male and male and male and male and male} ) \\ \vspace{5} \\ &=& \ P(\mbox{male} )\times P(\mbox{male} )\times P(\mbox{male} )\times P(\mbox{male} )\times P(\mbox{male} ) \\ \vspace{5} \\ &=& \ (0.41)(0.41)(0.41)(0.41)(0.41) \\ \vspace{5} \\ &=& \ (0.41)^5 \\ \vspace{5} \\ &\approx& \ 0.0116 \end{eqnarray}