Statistical operations with AddUp are performed with a set of functions that apply to a list of numbers or arbitrary length. Statistical functions provide summary information on the content of the list. Each function accepts a lists of arguments containing as many numbers as needed to represent a group under statistical study.

Statistical functions include:

- avg or mean
- Returns the average (or mean) of a list of values. It returns 0 on an empty list, or the average value if the list is not empty. The average or mean is the sum of all values in a list divided by the item count.
- avgG
- Returns the geometric average of a list of values. It returns 0 on an empty list, or the geometric average value if the list is not empty. The geometric average of a list of values is the result of adding the square of all values (eg. using the sum2 function) and extracting the 'count' root of this sum.
- count
- Returns the count of values in a list (the total number of items). It returns 0 on an empty list, or the number of arguments if the list is not empty.
- gcd or gcf
- Returns the greatest common denominator (greatest common factor) of all values in a list. It returns 0 on an empty list, or the greatest common denominator of all values if the list is not empty.
- lcm
- Returns the least common multiple of all values in a list. It returns 0 on an empty list, or the least common multiple of all values if the list is not empty.
- max
- Returns the maximum value contained in a list. It returns 0 on an empty list, or the value of the largest argument if the list is not empty.
- median
- Returns the median of a list of values. It returns 0 on an empty list, or the median value if the list is not empty. The median value is the value that is at the center position of a list after it is sorted. For lists containing an even number of values, it is the average of the values found at the two middle positions.
- min
- Returns the minimum value contained in a list. It returns 0 on an empty list, or the value of the smallest argument if the list is not empty.
- prod
- Returns the product of all values contained in a list. It returns 0 on an empty list, or the product of all values if the list is not empty.
- sd
- Returns the sample standard deviation of a list of values. It returns 0 on an empty list, or the sample standard deviation if the list is not empty.
- sdP
- Returns the population standard deviation of a list of values. It returns 0 on an empty list, or the population standard deviation if the list is not empty.
- sum
- Returns the sum of all values contained in a list. It returns 0 on an empty list, or the sum of all values if the list is not empty.
- sum2
- Returns the sum of the square of all values contained in a list. It returns 0 on an empty list, or the sum of the square of all values if the list is not empty.
- var
- Returns the sample variance of a list of values. It returns 0 on an empty list, or the sample variance if the list is not empty.
- varP
- Returns the population variance of a list of values.It returns 0 on an empty list, or the population variance if the list is not empty.