Define Average

Definition An Average is representation of a group in a single value. To find an average of a group :- Step 1 = Sum all the observations of the given group. Step 2 = Divide the sum(of step 1) by the number of observations of the given group. Above steps give formula for finding Average : Average = (Sum of Observations) ÷ (Number of Observations) = Sum of Observations Number of Observations Following are some examples of Averages Example 1 = Find the average of given numbers 10, 20, 30, 40. Answer = The proceed is as :- Sum of observations = 10 + 20 + 30 + 40 = 100 Number of observations = 4 Average of given numbers = sum of observations / number of observations = 100 / 4 = 25 Example 2 = Find the average of first five natural numbers. Answer = First Five Natural Numbers = 1, 2, 3, 4, 5 Average of First Five Natural Numbers = sum of first five natural numbers / number of natural numbers (1 + 2 + 3 + 4 + 5) 5 15 / 5 = 3 Example 3 = Mark obtained by 4 student in a class are 20, 35, 42, 13,Find the average marks obtained by them. Answer = Average Marks Obtained = sum of marks / number of students (20 + 35 + 42 + 13) 4 110 / 4 = 27.5