Abundant is a number for which the sum of all its proper factors is greater than the number itself.Deficient is a number for which the sum of all its proper factors is less than the number...
Mean can mean you are being rude or in math terms it is adding a set of numbers then dividing by the total amount. ex. If your numbers are 1,2,and 3 add them to get 6 and divide by 3. You get 2.