what is mean, median and mode of grouped data

i dont want d formula.i want d explaination

Mean:

The mean (or average) of observations, as we know, is the sum of the values of all the observations divided by the total number of observations. 

Mode:

The value of a data set that occurs most often is known as the mode of the data set.

For example, in the given data set 2, 6, 7, 5, 4, 2, 6, 7, 9, 7, 8, 3, 2, 11, the number 7 and 2 occur most often (3 times). Therefore, both 7 and 2 are the modes of the given set of numbers.