A normal distribution is projected as a bell shaped distribution with the area can be symmetrically divided into two. In this case, the problem says non-symmetric districution which would have to be a skewed distribution. This type of distribution has unequal areas of each side which can be left or right.
The two classes are the proletariat which is the working class who make up the majority of the population within society and must work to survive
The Mississippi river and other western tributaries most notably the Missouri river formed pathways for western expansion.
The Egyptians failed to adapt to the new changes of their world. There are multiple books on this and it is very interesting.
