Basic Formulas (Sum, Average, Percentage) A sum is a mathematical operation that combines the values of multiple items to find a single total. It's often...
A sum is a mathematical operation that combines the values of multiple items to find a single total. It's often represented by the Greek letter Σ (sigma).
Example:
Let's add the following numbers: 5, 10, 15, and 20.
Sum = 5 + 10 + 15 + 20 = 50
Another way to find the sum is to simply add the values together: 5 + 10 + 15 + 20 = 50.
Average is the sum of a set of numbers divided by the number of values in the set. The average is often represented by the Greek letter ¯ (double bar).
Example:
Let's add the following numbers: 5, 10, 15, and 20.
Average = (5 + 10 + 15 + 20) ÷ 4 = 15
The average of the given numbers is 15.
Percentage is a measure that expresses the relationship between a part and the whole. It's often expressed as a percentage sign (%).
Example:
Let's say we have a bag of cookies that contains 10 cookies.
Percentage of cookies in the bag = (number of cookies in the bag ÷ total number of cookies) × 100% = 10%
This means that there are 10 cookies in the bag that are out of the total 10 cookies in the bag