Mean = (Sum of observations)/(Number of observations)

Mean is also called Arithmetic Mean (AM) or average as well.

Let’s look at some examples.

**
Runs scored by Virat Kohli are 120, 24, 48, 64, 29, 64, 71, 3, 64, 29
**

**
Find his average score.
**

Average Score = (Sum of observations)/(Number of observations)

= (120 + 24 + 48 + 64 + 29 + 64 + 71 + 3 + 64 + 29)/10

= 516/10

= 51.6

Thus, average score is
**
51.6
**

**
Marks scored by Satvik in his test are 48, 91, 83, 83, 95.
**

**
What is his mean marks?
**

Mean = (48 + 91 + 83 + 83 + 95)/5

= 516/10

= 80

Thus, mean marks is 80