(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

 

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