Which of these is a fundamental prerequisite to achieving the “American Dream"?

In a symmetric bell-shaped distribution,

A) Most scores fall in the middle, with fewer scores in the tails. B) Most scores fall in the top end, with few scores in the middle. C) Most scores fall in the bottom end, with few scores in the middle. D) None of the above

Alexander von Humboldt ______.

a. first mapped the world using a system of degrees that measured distances from the equator b. is best known as the father of cartography c. made the first calculation of the circumference of the earth d. made the first systematic observations about the climate as related to geography