(11·珠海)(本题满分6分)某校为了调查学生视力变化情况,从该

(11·珠海)(本题满分6分)某校为了调查学生视力变化情况,从该校2008年

入校的学生中抽取了部分学生进行连续三年的视力跟踪调查,将所得数据处理,制成拆线统

计图和扇形统计图,如图所示:

(1)该校被抽查的学生共有多少名?

(2)现规定视力5.1及以上为合格,若被抽查年级共有600名学生,估计该年级在2010年有多少名学生视力合格.

 

答案

(1)被抽查的学生共有:80÷40%=200(人)           ……………………3分

(2)视力合格人数约有:600×(10%+20%)=180(人)……………………6分

解析:略

 

相关题目

I like these English songs and they           many times on the radio.
I like these English songs and they           many times on the radio. A.taught             B.have taught      C.are taught      D.have been taught  
在一个生态系统中,A种群有N个个体,B种群有100N个个体,C种
在一个生态系统中,A种群有N个个体,B种群有100N个个体,C种群有1000N个个体,D种群有10000N个个体,则它们的食物链关系是             (  )  
已知数列的前项和为. (Ⅰ)求数列的通项公式;    (Ⅱ
已知数列的前项和为. (Ⅰ)求数列的通项公式;    (Ⅱ)若,求的值.
   You probably know you should say please and thank you at restaurants. You
   You probably know you should say please and thank you at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have musi
   The iPhone, the iPad: each of Apple’s products sounds cool and has becom
   The iPhone, the iPad: each of Apple’s products sounds cool and has become a fad(一时的风尚). Apple has cleverly taken advantage of the power of the letter “i” –-- and many other b
We ______ for a picnic if it ______ rain this Sunday.A. go; doesn’t      
We ______ for a picnic if it ______ rain this Sunday.A. go; doesn’t             B. will go; won’t C. will go; doesn’t      D. go; won’t
随着物质生活水平的逐步提高,人们的精神需求也不断提高。
随着物质生活水平的逐步提高,人们的精神需求也不断提高。人们在闲暇之余,进行观光旅游,网上冲浪,穿衣讲“服饰文化”,吃饭讲“饮食文化”,
 “缥缈的雾,晶莹的露,凝重的霜,轻柔的雪,同样的水分
 “缥缈的雾,晶莹的露,凝重的霜,轻柔的雪,同样的水分子,装扮着我们生活的时空”。这是一首描述物理现象的抒情诗.对这首诗中所描述的物理

最新题目