Solution:
Given the set of data for time in minutes below
[tex]\lbrace9,15,5.7,9,12,11,4\rbrace[/tex]To find the mean of the given data, the formula is
[tex]\begin{gathered} \bar{x}=\frac{\sum_^x}{n} \\ n\text{ is the number of terms} \end{gathered}[/tex]Substitute the data into the formula above
[tex]\begin{gathered} \bar{x}=\frac{9+15+5+7+9+12+11+4}{8} \\ \bar{x}=\frac{72}{8} \\ \bar{x}=9 \end{gathered}[/tex]The mean is 9.
Hence, the statement that is true is
The mean is greater than 8