摘要：据2007年5月26日报道.我省有关部门要求各中小学要把“每天锻炼一小时 写入课表．为了响应这一号召.某校围绕着“你最喜欢的体育活动项目是什么? 的问题.对在校学生进行了随机抽样调查.从而得到一组数据．图1是根据这组数据绘制的条形统计图．请结合统计图回答下列问题: (1)该校对多少名学生进行了抽样调查? (2)本次抽样调查中.最喜欢篮球活动的有多少人?占被调查人数的百分比是多少? (3)若该校九年级共有200名学生.图2是根据各年级学生人数占全校学生总人数的百分比绘制的扇形统计图.请你估计全校学生中最喜欢跳绳活动的人数约为多少? 解:(1)由图1知:(名)···················································· 2分 答:该校对50名学生进行了抽样调查． (2)本次调查中.最喜欢篮球活动的有18人．···························································· 1分 ········································································································ 1分 最喜欢篮球活动的人数占被调查人数的． (3) (人)······························· 2分 (人)··················································································· 2分 答:估计全校学生中最喜欢跳绳活动的人数约为160人．

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