题干

下列随机事件模型属于古典概型的有几个(   )

(1) 在平面直角坐标系内,从横坐标和纵坐标都是整数的所有点中任取一点

(2) 某射手射击一次,可能命中0环、1环、2环…,10环.

(3) 一个小组有男生5人,女生3人,从中任选1人进行活动汇报.

(4) 一只使用中的灯泡的寿命长短.

(5) 抛出一枚质地均匀的硬币,观察其出现正面或反面的情况.

A:1

B:2

C:3

D:4

上一题 下一题 0.0难度 选择题 更新时间:2018-01-23 10:03:26

答案(点此获取答案解析)

B

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下列有关溶液的叙述正确的是(  )


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若(x﹣3)•A=x2+2x﹣15,则A=____.

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下面是1901年、1981年印度妇女就业分布简表。表格信息客观上反映了印度(    )

时间

第一产业

第二产业

第三产业

1901年

74%

15%

11%

1981年

82%

7%

11%

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求曲线y=x2与y=x所围成图形的面积,其中正确的是(  )

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阅读下列短文,从每题所给的 A、B、C 和 D 四个选项中,选出最佳选项。
    A high school senior from Houston, Texas, was accepted by each of the 20 top-ranked universities to which he applied — and was offered a full scholarship to every single one of them.
    Michael Brown, a 17-year-old student at Lamar High School, went viral(迅速成名) after he was caught on camera screaming in glee upon learning he was accepted into Stanford University in December.
    Little did the teen know at the time, but his excitement would increase by a factor of 20 in March when he was also accepted into Harvard, Princeton, Yale, the University of Pennsylvania, Georgetown, Northwestern, Vanderbilt and the University of Michigan, among other prestigious(著名的) colleges.
    But what did it take for Brown to pull off his flawless(完美无瑕的) clean sweep?
    To start, the high schooler has an impressive 4.68 grade point average and an SAT score of 1540 out of 1600. His ACT score, a 34 out of a possible 36, proved to be just as excellent. Brown's extracurriculars also include various internships as well as participation on his high school's debate team.
    His mother, Berthinia Rutledge-Brown, told The New York Times that she was simply blown away by her son's perfect performance. "He actually earned it," she told the Times. “I always knew Mike would get into a good school. I always knew he'd get good scholarship support. But I never imagined this."
    So, which school will he be attending this fall? Although Brown remains undecided at the moment, he reportedly plans to major in political science and hopes to one day become a lawyer.
    He will make the big decision by May 1.
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