Measures of central tendency

Mean:
                      -- The mean is found when the numbers of data entries dividing and adding up all of the given data. It is also known as the average.
                Example:
                             - the grades were as follows,  the class of grade 110 math had a mathematics test recently:
 
                                       78
                                       66
                                       82                                  464 / 6 = 77.3
                                       89
                                       75                        Hence, the mean average of the class is 77.3.
                                    + 74
                                      464
     Median:
                      -- The middle number is the median.  First you arrange the numbers in order from lowest. Firstly, from the lowest, in order you arrange the numbers
                to highest, by crossing off the numbers until you reach the
                middle then you find the middle number.
              Example:
                               - to find the median, use the above data:
                                                66  74  75  78  82  89\
                            - There is no middle number, as you can see we have two numbers  What should we do?
                    find the average and we take the two middle numbers , ( or mean ).  It is simple;
                                                             75 + 78 = 153
                                                              153 / 2 = 76.5
                             Hence,  76.5 is the middle number.
 
         Mode:
                        -- this is the number that most often occurs.
                 Example:
                                 - the following data below, find the mode:
 
                                    78  56  68  92  84  76  74  56  68  66  78  72  66
                                    65  53  61  62  78  84  61  90  87  77  62  88  81
                                                   78 is the Mode.