1950-2000 was the most evident of time periods growth in the south and west. This is because there were 6 cities in the top ten from the south/west around the 2000 meanwhile there was only 1 in the top ten during the 1950's.
answer: expected value of x = 1.0
p(x=0) = 0.25
p(x=1) = 0.50
p(x=2) = 0.25
expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0
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