题干

某学校为了解学生每周在饮料方面的花费情况进行了抽样调查,调查结果制成了条形统计图和扇形统计图.请你结合图中信息完成下列问题:

(1)补全条形统计图.

(2)本次抽样调查了多少名学生?

(3)请求出抽样调查的数据的平均数,并直接写出中位数和众数.

(4)扇形统计图中,花费20元的人数所在扇形圆心角度数为多少度?

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