Mean would be used in such a situation, when you have to use all the values in the data and median is used in such a situation that you have to use only two values i.e upper and lower values and Mode is used when your data is unobservable like if you want to find the opinion of people.
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MEAN
the median and mode are but the mean is not
The median is 9 and the mode is 18 and the mean is 11
mean: 1.7 median:1.7 mode: none
Mean, median, and mode are all equal in a normal distribution.