Changes

'''Mean''' is the average of a group of numbers.  To find the mean, the numbers are added and divided by the number of numbers in the group.  For example: to find the mean of 3, 4, 6, and 7, we add them together: <math>3 + 4 + 6 + 7 = 20</math>.  Then we divide them by the number of numbers in the group, which is 3.  <math>20/4 = 5</math>.

'''Mean''' is the average of a group of numbers.  To find the mean, the numbers are added and divided by the quantity of numbers in the group.  For example: to find the mean of 3, 4, 6, and 7, we add them together: <math>3 + 4 + 6 + 7 = 20</math>.  Then we divide them by the quantity of numbers in the group, which is 4.  <math>20/4 = 5</math>.