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## Define Arithmetic Mean - find mean from given data

**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

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

Mean = sum of first five natural numbers / number of natural numbers

Mean = (1 + 2 + 3 + 4 + 5) / 5

Mean = 15 / 5 = 3

Average Marks Obtained = sum of marks / number of students

= (20 + 35 + 42 + 13) / 4

= 110 / 4 = 27.5