Mean Formula
The mean formula is the average of the numbers and is used to measure the central tendency of the data. The mean formula can also be defined as the sum of all observations to the total number of observations. In this section, we will learn more about the mean formula and how to apply it.
Formula to Calculate Mean
The formula to calculate the mean will be helpful in solving a majority of the topics related to the mean. The mean formula of given observations can be expressed as,
Mean Formula = (Sum of Observations)/(Total Numbers of Observations)

Example 1: The marks obtained by 8 students in a class test are 12, 14, 16, 18, 20, 10, 11, and19. Find out what is the mean of the marks obtained by the students?
Solution:
To find: Mean of marks obtained by 8 students
Marks obtained by 8 students in class test = 12, 14, 16, 18, 20, 10, 11, and19 (given)
Total marks obtained by 8 students in class test =(12+14+16+18+20+10+13+19) =122
Using mean formula,
Mean = (Sum of Observation)/(Total numbers of Observations) = 122/8 = 15.25
Answer: The mean of marks obtained by 8 students is 15.25.

Example 2: The heights of five students are 161 cm, 130 cm, 145 cm, 156 cm, and,162 cm respectively. Find the mean height of the students.
Solution:
To find: the mean height of the students.
The heights of five students = 161 cm, 130 cm, 145 cm, 156 cm, and,162 (given)
Sum of the heights of five students =(161+130+145+156+162) = 754
Using Mean Formula,
Mean = {Sum of Observation}/{Total numbers of Observations}= 754/5=150.8
Answer: The mean height of the students is 150.8 cm.