For this question, first, we ordered the given data from lowest to highest:
[tex]3,4,4,5,6,7,7,8,8,8,8,9[/tex]Now, we use the formula for the mean of a data set:
[tex]\text{Mean}=\frac{3+4+4+5+6+7+7+8+8+8+8+9}{12}=\frac{77}{12}\approx6.42[/tex]From the ordered data we get that:
[tex]\begin{gathered} \text{Mode}=8 \\ \text{Median}=\frac{7+7}{2}=7 \end{gathered}[/tex]