The term average means _______.
a. there are an equal number of employees earning above the amount provided and an equal number earning below the amount provided
b. there are an equal number of employees earning above the amount provided but not an equal number of employees earning below the amount provided
c. there are an equal number of employees not earning above the amount provided but an equal number of employees earning below the amount provided
d. The number calculated by adding all numbers together, then dividing by the total amount of numbers