Consider the following two problems. When an expression begins with the leading keywords SUM or TOTAL the leading keyword defines the corresponding AND. The mean of a set of numbers sometimes simply called the average is the sum of the data divided by the total number of data.
Mathematician George Polyas book How to Solve It.
The last four keywords can be found in word problems and may indicate addition. Word problems illustrate a mathematical relationship between two or more variables. A mathematical problem expressed entirely in words typically used as an educational tool. Mathematician George Polyas book How to Solve It.