The results achieved experimentally, as compared to the expected results.

A number which is added to another.

A clock with hours marked from 1 to 12 arranged in a circle and moving hands to show you the time.

The arithmetic mean of a list of numbers is the sum of the data values divided by the number of terms in the list. 

In everyday language, the arithmetic mean is commonly called the average.

An array is an ordered collection of objects or numbers. Rectangular arrays are commonly used in primary mathematics. For example, two arrays of dots (2 by 12 and 4 by 6) produce two different representations of the number 24.