**Description: **The word mean, which is a homonym for multiple other words in the English language, is similarly ambiguous even in the area of mathematics. Depending on the context, whether mathematical or statistical, the mean can be mean because it can mean many different things. In its simplest mathematical definition regarding data sets, the mean used is the arithmetic mean, also referred to as mathematical expectation, or average. In this form, the mean refers to an intermediate value between a discrete set of numbers, namely, the sum of all values in the data set, divided by the total number of values.

**Formula**: 1) Mean Formula ,

x= 1Ni=1Nxi

2) Median Formula,

Median = (n2)th Term + (n2+1)th Term2

**Example****:**1) Mean Example

Mean = 10 + 2 + 38 + 23 +38 + 23 + 217= 1557= 22.143

2) Median Example

The median is the middle value, so to rewrite the list in order:

13, 13, 13, 13, 14, 14, 16, 18, 21

There are nine numbers in the list, so the middle one will be

9 + 12= 102= 5

5th number, So the median is 1

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