what is the formula of mean , median , mode ?

*Mean*

The **mean **(or average) of a set of data values is the sum of all of the data values divided by the number of data values.

That is:

**Median**

**Median**

The **median **of a set of data values is the middle value of the data set when it has been arranged in ascending order.

That is, from the smallest value to the highest value.

In General;

When n = no. of values is odd,

and

When n = number of values in the data set is even, then the **median **is the average of the two middle values.

*Mode*

*Mode*

The **mode **of a set of data values is the value(s) that occurs most often.

The formula used to find the mode when the data is given in groups is as follows.

Mode = |

Where,* l* = lower limit of the modal class

*h* = size of class interval (all class sizes should be equal)

*f*_{1} = frequency of the modal class

*f*_{0} = frequency of the class preceding the modal class

*f*_{2} = frequency of the class succeeding the modal class

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