How to find mean Practice Test

Consider the following data set:

$\left \{ 67, 68, 70,70, 70, 72, 74, 74, 79\right \}$

Which of these numbers is greater than the others?

Consider the following set of scores from a math test. What is the mean of these scores?

$\small \small \left \{ 70,89,67,77,92,83,67,75\right \}$