I studied in East Europe and post Soviet mathematical education program have no Median, Mode, and Range terms.
Mean (or average) on other hand was studied (with root mean square and sometimes with geometric mean).
Looking to education English sites I see a lot of lessons about Median, Mode, and Range.
These statistical parameters are strange for me. Why west schools use them?
Have Median and Mode any sense in mathematical statistics (in science)?
On
Of course they have their use. For example, roughly speaking mean and median serve the one purpose: to find the most typical value from dataset. But when median is more robust to so called outliers, mean is very sensitive to them. Suppose you have a dataset with hundreds of value around, say, 1, and one value around million. Mean will show value that is much higher than real typical value, but median will catch such situation. That's why typical salaries are usually computed with average, not median :)
Of course, it's all roughly speaking and specialists will gave deeper answer.
For certain data sets, such as income, mean can be strongly affected by outliers, while median is much more robust and better represents the data. More generally robust statistics investigates data sets that are not normally distributed.
Perhaps a regime that has political interest in having income appearing normally distributed, would prefer to not consider this example.