What is normal? And to whom?
Let me illustrate first some "definitions" of normal:
In behavior, normal refers to a lack of significant deviation from the average. The phrase "not normal" is often applied in a negative sense ...
en.wikipedia.org/wiki/Normal_(behaviour)
conforming with or constituting a norm or standard or level or type or social norm; not abnormal (unattributed)
From Merriam-Webster's Online Dictionary:
2 a : according with, constituting, or not deviating from a norm, rule, or principle b : conforming to a type, standard, or regular pattern
First let's examine average. What is the average? Well, that depends on quite a bit.
Where are you? If you live in Manhattan, average income exceeds $100,000 as of the 2005 census. I would imagine that it could be higher today. If you live in Mississippi, per capita income is $31,836 in 2009. Mississippian's, if they bother to be curious enough to check such things, should be very happy that they don't live in India. In India, per capita income is $1,016, ranking it number 142 in the world. I don't know how many countries were ranked.
But a monetary valuation of average is only one way to measure such things as averages, and really useful only because it is easy to quantify. Other things are much more important. Way of life, for instance.
Normal in Seattle, Washington:

Even that image is not a "normal" Seattle home. It depends on where you live in Seattle.
Normal in Afghanistan:
In the villages each family generally occupies either one mud-brick house or a walled compound containing mud-brick or stonewalled houses. The same pattern prevails among the nomads, except that tents replace the houses.
Twice a year groups of nomads may pass through villages on their routes from summer highland grazing grounds to the lowlands where they camp during the winter. The villagers traditionally permit the nomads to graze their animals over the harvested fields, which the flocks fertilize by depositing manure. The nomads buy supplies such as tea, wheat, and kerosene from the villagers; the villagers buy wool and milk products from the nomads. For food and clothing, the nomads depend on the milk products, meat, wool, and skins of their flocks; for transportation they depend on their camels. Nomadic women are freer and less secluded than the village women.
Normal for a ghetto kid is growing up with a distrust of and little esteem for officers of the law.
Normal for a Montana farm boy is learning how to ride a horse and working with your family in the fields.
Or is it...