Answer= 6.8
To find out the mean, you have to add all of the integers together, and then divide that number by how many units there are.
7.2 + 6.8 + 6.8 + 6.4 + 7.4 + 6.7 + 6.4 + 7.4 + 7.1 + 5.8
= 68
There are 10 units, so, you divide the answer by 10.
68 / 10 = 6.8