(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

Animals grow up in different ways. They have lots of lessons to learn. Some anim
Animals grow up in different ways. They have lots of lessons to learn. Some animals are born helpless but their mothers protect them. A newborn kangaroo is the size of a bee. She stays in her mother's
某公司有2位股东,20名工人. 从2006年至2008年,公司每年股东
某公司有2位股东,20名工人. 从2006年至2008年,公司每年股东的总利润和每年工人的工资总额如图12所示. 图12    (1)填写下表: 年      份2006年
My friend, Dick, has a large police dog. It’s name is Jack. Every Saturday af
My friend, Dick, has a large police dog. It’s name is Jack. Every Saturday afternoon Dick takes Jack for a long walk in the park. Jack likes these long walks very much.   One Saturday afternoon,
p{font-size:10.5pt;line-height:150%;margin:0;padding:0;}td{font-size:10.5pt;}(
p{font-size:10.5pt;line-height:150%;margin:0;padding:0;}td{font-size:10.5pt;}(09年深圳市一调)(选修3-3)(5分)如图表示一定质量的某气体在不同温度下的两条等温线
Allow others the space to voice their opinions, ______ they are different from y
Allow others the space to voice their opinions, ______ they are different from yours. A. as though       B. as if                C. unless               D. even thoug
 My best friend Neil is _________ honest boy. You can believe him.    A. an
 My best friend Neil is _________ honest boy. You can believe him.    A. an                             B. a                       C. the   
A warm-hearted person always thinks _________ others more than himself. A. to
A warm-hearted person always thinks _________ others more than himself. A. to B. over C. out D. of
《感动中国》走过了十年的历程,通过它,100多位人物和群
《感动中国》走过了十年的历程,通过它,100多位人物和群体的事迹超越了国界、民族和语言,走进人们的精神世界,挺起民族的精神脊梁。这说明,

最新题目