How to let the statistics cheat you profesionally? There is a story. The average salary of the whole city seems not very low. but there are lots of poor people in the city. Why?

A、Median is sensitive to large value.;
B、The mean is highly sensitive to a few large.
The rich people in the city are 20% but hold 80% properties. so the average salary are drag up by the few rich people's value and the mojorities are poor. So median is lower then mean.
;
C、The distribution is skewed. ;
D、It is not normal distribution