Mean income is not a good criterion to measure how prosperous a city is. Median would be a lot better, I will give an example. Suppose a city has 1000 people, 1 person earns 50 crore rupees per year, other 999 people earn 20000 rupees per year then the average income will be Rs 5,19,980 per year. Clearly this is not good. Median income is still 20000 rupees. I hope you apply some brain before publishing such articles
