SAT Question 40f0ee70: Distributions, Center & Spread answer and explanation with Desmos solution

The mean of a data set is the sum of the values in the data set divided by the number of values in the data set. It's given in the table that the times, in minutes, it took Robert to complete each of the tasks are $5$, $2$, $15$, $9$, and $9$. The sum of these times is $5+2+15+9+9$, or $40$, minutes. There are $5$ tasks in the project. Therefore, the mean time, in minutes, for Robert to complete a task for this project is $40÷5$, or $8$.