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Define Arithmetic Mean - find mean from given data



Formula:
Arithmetic Mean = (Sum of Observations) / (Number of Obervations)

Arithmetic Mean is known as Mean or Average

Following are some examples

Example 1 = Find the Arithmetic Mean of given numbers 10, 20, 30, 40.
Answer = The proceed is as :-
Sum of observations = 10 + 20 + 30 + 40 = 100
Number of observations = 4
Arithmetic Mean = sum of observations / number of observations
Arithmetic Mean = 100 / 4 = 25



Example 2 = Find the mean of first five natural numbers.
Answer = First Five Natural Numbers = 1, 2, 3, 4, 5
Mean = sum of first five natural numbers / number of natural numbers
Mean = (1 + 2 + 3 + 4 + 5) / 5
Mean = 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 = Marks obtained = 20, 35, 42,13

Average Marks Obtained = sum of marks / number of students
= (20 + 35 + 42 + 13) / 4
= 110 / 4 = 27.5

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