First step when finding the mean is to add all the values together 7 + -9 + 6 + -10 + -13 + -5 To make this easier, first add all the positive numbers 7 + 6 = 13 Then add (basically take away) the minus values one by one 13 - 9 = 4 4 - 10 = -6 -6 - 13 = -19 -19 - 5 = -24 Next step is to divide this total by the number of values there were In this case, there were 6 values -24 / 6 = -4 D. -4