HOW TO FIND MEAN AND MEDIAN OF A DATA.

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Mean:

Mean is usually known as average of data.Which is equal to the sum of total numbers divided by the total numbers.
Now we interpret it mathematically by a formula.

Mean=sum of total numbers ∕total numbers


Now we have data as below.We want to find its mean.
                         3,5,6,7,4,8,9,3,9
than the mean is,
           

               mean=3+5+6+7+4+8+9+3+9 / 9

                       mean= 54/9 
                                =6
so mean is 6 for the above data

Median;

             Median is the central value of the data.It mean the middle value of the date.There are two formulas to find the mean.First one is when the data is odd. and the second is when the data is even.
Even and odd is decided on the basis of n.n is the total numbers.

For odd data the formula is,
                    Median=[(n+1)/2]th value.  Here n is total numbers.
For even data we add the two middle values and divide it with 2.
Let's take the following data which is odd.
       3,6,5,8,3,5,3
Here n=7
so,
  mean= [(7+1)/2]th value
           =4th value 
so in the data the no which is in 4th p;ace is 8.So 8 is the median for above data.
Now we have eve data.
    3,4,5,6,8,11
So we take the two middle values from the data which are 5 and 6 respectively.
     
      Mean=(5+6)/2
      Mean=5.5
So the mean for above data is 5.5.

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