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58.给出一个柱形图，横坐标是六至十二月的平均每日用电量。 纵坐标是千瓦。 每月头600度电每度$0。14，超过的每度$0。11。 求八月的cost. 59.给出一个柱形图，横坐标是working hours,纵坐标是人数。 求working hours 的median. 60.DS, 不放回抽样，共有English and Spanish 良种，抽两本，问抽得at least one english book的概率。 1)english 与spanish 的比是1：3 2)书的总数少于20本 61.scientist studies the migration trend of a group of geese. The group contains 30% male geese. Among the geese that later on migrated, 20% are male. What is the ratio of migration factor for male geese to the migration facotr for female geese? Solution: Assume total geese X, of which Y migrated. The answer is simple / = ... 62.Some guy has 6 albums of anthology from which he read one poem at least. All peoms in the albums are different. Did he read more than 6 poems from at least one of the album? a) he has read 22 poems in total. b) the numbers of poems he read from each album are all distinct. Anwser: C 63. k, l, m are positive integers, does k has more prime factors than m a) k = 30l b) m = 10^k Answer: C | 
