题干

在大课间活动中,同学们积极参加体育锻炼.小丽在全校随机抽取一部分同学就“一分钟跳绳”进行测试,并以测试数据为样本绘制如图所示的部分频数分布直方图(从左到右依次分为六个小组,每小组含最小值,不含最大值)和扇形统计图,若“一分钟跳绳”次数不低于130次的成绩为优秀,全校共有1200名学生,根据图中提供的信息,下列说法不正确的是(   )

A:第四小组有10人

B:第五小组对应圆心角的度数为45°

C:本次抽样调查的样本容量为50

D:该校“一分钟跳绳”成绩优秀的人数约为480人

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答案(点此获取答案解析)

B

同类题1

阅读下列短文,然后从每小题A、B、C、D 中选出能回答所提问题或完成所给句子的最佳答案。    

    Some people believe that schools will no longer be necessary in the near future. They said that because of the Internet and other new technology, there is no longer any need for school buildings, classes or teachers. Perhaps this will be true one day, but if the world has no schools, I can't imagine how our society will be. In fact, we should learn how to use new technology to make schools better. We should invent a new kind of school that is linked to libraries, museums, science centers, labs and even companies. Technological companies should create(创造) learning programs for schools. Scientists or professors could give talks through the Internet. TV networks and local stations could develop programs about things students are actually studying in school. Labs could set up websites to show new technology so students could see it on the Internet.

    Is this a dream? No. There are already many cities where this is beginning to happen. Here the whole city is linked to the Internet, and learning can take place at home, at school, and in the office. Businesses provide programs for the schools and the society. The schools provide computer labs for people without their own computers at home. Because everyone can be on the Internet, older people use it as much as younger ones. And everyone can visit distant(远处的) libraries and museums as easily as nearby ones. How will this new kind of school change the usual way of learning? It is too early to be sure, but it is very exciting to think about it. Technology will change the way we learn; schools will change as well; and we will all learn something from the Internet.