To find the mean of departures, we add up all the data and divide by the amount of years, as following:
[tex]\begin{gathered} \frac{11.1+11.3+10.5+10.3+9.9+10.8+11.1+10.5+10.8+10.5}{10} \\ \rightarrow10.7 \end{gathered}[/tex]To calculate the median:
1. Organize the data in numerical order:
[tex]\begin{gathered} 9.9 \\ 10.3 \\ 10.5 \\ 10.5 \\ 10.5 \\ 10.8 \\ 10.8 \\ 11.1 \\ 11.1 \\ 11.3 \end{gathered}[/tex]2. Divide the number of data by 2:
[tex]\frac{10}{2}=5[/tex]3. Go to the number in that position and average it with the next one to get the median:
[tex]\frac{10.5+10.8}{2}\rightarrow10.7[/tex]The median is 10.65
The number that appears most often is 10.5
Thereby, the mode is 10.5