题干

为调查八年级学生完成作业的时间,某校抽查了8名学生完成作业的时间,依次是:75,70,90,70,70,58,80,55(单位:分钟),那么这组数据的众数、中位数和平均数依次为(    ).

A:70 70 71

B:70 71 70

C:71 70 70

D:70 70 70

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答案(点此获取答案解析)

A

同类题4

阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项。

    H. G. Wells lived from 1866 to 1946. He wrote many famous stories. He was best at writing stories about the future. One story is called The Time Machine. Here is the story.

    More than 100 years ago, there was an English scientist and inventor living in London. One day, four friends went to his house for dinner. The inventor was not there. Feeling hungry, they started dinner without him. Then they heard a sound. A few moments later, the inventor came in, looking dirty.

    He told his friends that he built a time machine. He could travel into the future.

    The inventor went thousands of years in the future. He met people called the Eloi. They were smaller than him. They had no machines. Growing fruit and vegetables was all that they did. They had no hobbies. Only one girl, Weena, spoke to him.

    Four days later, he met other people called Morlocks. They lived underground. They caught Eloi people and ate them! The inventor wanted to fight against the Morlocks. The Eloi didn't want to help him, not even the strong men. He tried to fight against the Morlocks. At last, Weena went underground with him. Unfortunately, Weena died.

    After that, he got in his time machine. He came back to his time. Seeing the future made him sad. The people in the future were worse. They were not clever.

    His friends didn't think it was a real story. But they never saw him again. Maybe he went to save the future.