Understanding Median Formula

Introduction:

                    The "median" is the "middle" value in the list of numbers. To find the median, your numbers have to be listed in numerical order, so you may have to rewrite your list first.

What is median:

Median (a): constituting the middle value of an ordered set of values is called median.
                     The set of values arranged in Lower value to higher value (increasing order).If the set of data has an odd number of entries, the median formula is the middle value of the set after sorting the list into increasing order.
                     If the set of data has an even number of means , the median is equal to the sum of the two middle value (after sorting) numbers  and divided by two.

The median is the middle value, so I'll have 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 the (9 + 1) ÷ 2 = 10 ÷ 2 = 5th number:

Formula for the Median,

                                     M=(n+1)/2

                                          here,

                                                  M - median,

                                                   n - total number of values present in the set.

Hope you liked the above explanation. Please leave your comments, if you have any doubts.