Answer to Question 1
ANSWER: Humid subtropical climates experience adequate and fairly well-distributed precipitation throughout the year, with typical annual averages between 80 and 165 cm (31 and 65 in.). In summer, when thunderstorms are common, much of the precipitation falls as afternoon showers. Tropical storms entering the United States and China can substantially add to their summer and autumn rainfall totals. Winter precipitation most often occurs with eastward-trekking middle-latitude cyclonic storms.
Answer to Question 2
ANSWER: Semi-arid (BS) climates are referred to as steppe, which typically have short bunch grass, scattered low bushes, sparse trees, or sagebrush. In North America, this climatic region includes most of the Great Plains, the southern coastal sections of California, and the northern valleys of the Great Basin. As for arid regions, northern areas experience lower winter temperatures and more frequent snowfalls. Annual precipitation is generally between 20 and 40 cm (8 and 16 in.).
Geographic distribution of early hominins.
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The expected value for a binomial probability distribution is _____.