The term average can technically refer to a variety of mathematical ideas, but on the test, it refers to the arithmetic mean. It is found by adding the numbers given and then dividing this sum by the number of items being averaged. Hence the basic equation for average questions is:
Just in simple words, on the Test, the average (also called arithmetic mean) of a set of 5 numbers is simply the sum of all the numbers divided by 5. In other words, if you want to find the average of three numbers add them up and divide by 3.
Single Unit Quantities
The Test does not always write average questions with clear solutions. The easy questions base normally on single unit quantities like Currency, temperature, height, weight (Kgs).
If the question on the Test gives you the monthly incomes (in any currency) of five persons, you can find the average simply by adding the income of all five persons and then dividing it by 5.
Sum of entities = (Number of entities) × Average. The average of two numbers is 5, the sum of the numbers is 5×2 = 10.
Average is also called as mean or arithmetic mean. It gives the central value of data.
Averages (Mixed Unit Quantities)
The quantities described by at least two other quantities cannot be averaged by using the basic equation of arithmetic mean rather, to feel comfortable in time management, you’ll have to use CAT table method explained by following examples.