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某校学生会对本校学生收看"世界杯"足球赛的情况作...

(1)为了使收集到的数据具有代表性,学生会在确定调查对象时选择了方案C;(2)众数是:1.5小时;(3)800×3815+27+38+13+7=304(人).则估计该校800名学生中每天做作业用1.5小时的人数是304人.

(1)20,500。(2)200,统计图见解析(3) 解:(1)20,500。(2)∵500×40%=200,∴C组的人数为200。补全“捐款人数分组统计图1”如图: (3)∵D、E两组的人数和为:500×(28%+8%)=180,∴捐款数不少于30元的概率是: 。(1)根据A、B两组捐款...

(1)66÷33%=200,40200×360°=72°,故答案为:200,72; (2)200×10%=20(名),200-40-24-66-20=50(名),如右图所示:(3)24200×2400=288(名),答:估计该校2400名同学中喜欢羽毛球运动的有288名同学.

解:(1)设捐款30元的有6x人,则8x+6x=42∴ x=3∴ 捐款人数共有:3x+4x+5x+8x+6x=78(人)。(2)由图象可知:众数为25(元);由于本组数据的个数为78,按大小顺序排列处于中间位置的两个数都是25(元),故中位数为25(元)。(3)全校共捐款...

(1)根据题意得:30÷50%=60(名),“了解”人数为60-(15+30+10)=5(名),“基本了解”占的百分比为1560×100%=25%,占的角度为25%×360°=90°,补全条形统计图如图所示:(2)根据题意得:900×15+560=300(人),则估计该校学生中对将“剪刀石头布”...

不唯一Dear Ms Smith, I’m Li Hua, Chair of the Student Union of Yucai Middle School, which is close to your University. I’m writing to invite you to be a judge at our English speech contest to be held in our school on June 1 st...

(1)根据条形图4+16+12+10+8=50(人),m=100-20-24-16-8=32;(2)∵.x=150(5×4+10×16+15×12+20×10+30×8)=16,∴这组数据的平均数为:16,∵在这组样本数据中,10出现次数最多为16次,∴这组数据的众数为:10,∵将这组样本数据按从小到大的顺序...

Hi, I'm li hua, is a school student body President. Recently many students all like to eat fast food. Because fast food variety but also very convenient. Students do not need to go to the dining hall lined up to eat, so many st...

We have planned several activities. When we get there,we will visit the elderly in their rooms in groups,presenting them with flowers and self-made cards to show our respect and love. Then we will do some cleaning and washing ...

Dear Ms.Smith, Our school decides to hold an English compitition and hope that you can come and be our judges.I am sure that you will have a particular nice time! And there are something important to tell you.The topic of the c...

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