题干

期中考试后,班里有两位同学议论他们所在小组同学的数学成绩,小明说:“我们组成绩是86分的同学最多”,小英说:“我们组的7位同学成绩排在最中间的恰好也是86分”,上面两位同学的话能反映出的统计量是(  )

A:众数和平均数

B:平均数和中位数

C:众数和方差

D:众数和中位数

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答案(点此获取答案解析)

D

同类题3

阅读理解

    Proudly reading my words, I glanced around the room, only to find my classmates bearing big smiles on their faces and tears in their eyes. Confused, I glanced toward my stone-faced teacher. Having no choice, I slowly raised the report I had slaved over, hoping to hide myself. “What could be causing everyone to act this way?”

    Quickly, I flashed back to the day Miss Lancelot gave me the task. This was the first real talk I received in my new school. It seemed simple: go on the Internet and find information about a man named George Washington. Since my idea of history came from an ancient teacher in my home country, I had never heard of that name before. As I searched the name of this fellow, it became evident that there were two people bearing the same name who looked completely different! One invented hundreds of uses for peanuts, while the other led some sort of army across America. I stared at the screen, wondering which one my teacher meant. I called my grandfather for a golden piece of advice; flip (掷) a coin. Heads—the commander, and tails—the peanuts guy. Ah! Tails, my report would be about the great man who invented peanut butter, George Washington Carver.

    Weeks later, standing before this unfriendly mass, I was totally lost. Oh well, I lowered the paper and sat down at my desk, burning to find out what I had done wrong. As a classmate began his report, it all became clear, “My report is on George Washington, the man who started the American Revolution.” The whole world became quite! How could I know that she meant that George Washington?

    Obviously, my grade was awful. Heartbroken but fearless, I decided to turn this around. I talked to Miss Lancelot, but she insisted: No re-dos; no new grade. I felt that the punishment was not justified, and I believed I deserved a second chance. Consequently, I threw myself heartily into my work for the rest of the school year. Ten months later, that chance unfolded as I found myself sitting in the headmaster's office with my grandfather, now having an entirely different conversation. I smiled and flashed back to the embarrassing moment at the beginning of the year as the headmaster informed me of my option to skip the sixth grade. Justice is sweet!

同类题5

阅读下面的文言文,完成下列各题。

与李翱书1

韩愈

    使至,辱足下书,欢愧来并,不容于心。嗟乎!子之言意皆是也。仆虽巧说,何能逃其责耶?然皆子之爱我多,重我厚,不时人待我之情,而以子之待我之意,使我望于时人也。

    仆之家本穷空,重遇攻劫,衣服无所得,养生之具无所有,家累仅三十口,携此将安所归托乎?舍之入京,不可也,挈之而行,不可也,足下将安以为我谋哉?此一事耳,足下谓我入京城,有所益乎?仆之有子,犹有不知者,时人能知我哉?持仆所守,驱而使奔走伺候公卿间,开口论议,其安能有以合乎?仆在京城八九年,无所取资,日求于人以度时月,当时行之不觉也,今而思之,如痛定之人思当痛之时,不知何能自处也。今年加长矣,复驱之使就其故地,是亦难矣。所贵乎京师者,不以明天子在上,贤公卿在下,布衣韦带之士谈道义者多乎?以仆遑遑于其中,能上闻而下达乎?其知我者固少,知而相爱不相忌者又加少。内无所资,外无所从,终安所为乎?

    嗟乎!子之责我诚也,爱我诚多也,今天下之人,有如子者乎?自尧舜以来,士有不遇者乎?无也?子独安能使我洁清不洿,而处其所可乐哉?非不愿为子之所云者,力不足、势不便故也。仆于此岂以为大相知乎?累累随行,役役逐队,饥而食,饱而嬉者也。其所以止而不去者,以其心诚有爱于仆也。然所爱于我者少,不知我者犹多,吾岂乐于此乎哉?将亦有所而求息于此也。

    嗟乎!子诚爱我矣,子之所责于我者诚是矣,然恐子有时不暇责我而悲我,不暇悲我而自责且自悲也。及之而后知,之而后难耳。孔子称颜回:“一箪食、一瓢饮,人不堪其忧,回也不改其乐。”彼人者,有圣者为之依归,而又有箪食瓢饮足以不死,其不忧而乐也,岂不易哉!若仆无所依归,无箪食,无瓢饮,无所取资,则饿而死,其不亦难乎?子之闻我言亦悲矣。

    嗟乎,子亦慎其所之哉!离违久,乍还侍左右,当日欢喜,故专使驰此,候足下意,并以自解。愈再拜。

【注】1本文写于贞元十五年(公元799年),时李翱在长安,韩愈在武宁节度使张建封幕府任节度推官。李翱,中唐著名的古文家、哲学家。从韩愈学古文,实则处师友之间。