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what is mean,median,mode and range
The mean, median and mode are types of average.
               The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers.
        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.
                  The "mode" is the value that occurs most often.
                    The "range" is just the difference between the largest and smallest values.


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