某校对该校七年级(1)班全体学生的血型做了一次全面调查,根据

某校对该校七年级(1)班全体学生的血型做了一次全面调查,根据调查结果绘制了下列两幅不完整的统计图,请你根据统计图提供的信息解答以下问题:

1)该校七年级(1)班有多少名学生。(3)

2)求出扇形统计图中“O型”血所对扇形的圆心角的度数。(3分)

3)将条形统计图中“B型”血部分的条形图补充完整。(2分)

答案

解:(1)由两个统计图可得:七年级(1)班“A型”血有8人,占班级人数的16%,设全班x人,则解得:x=50

答:该校七年级(1)班有50名学生…………3

2)依题意有“O血占的百分比为:100%32%16%12%=40%

于是:

所以扇形统计图中“O血所对扇形的圆心角的度数144°. …..3

3)补全条形统计图略                     …….2

(其它解法同样给分)

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