题干

某中学图书馆将图书分为自然科学、文学艺术、社会百科、哲学四类.在“读书月”活动中,为了了解图书的借阅情况,图书管理员对本月各类图书的借阅进行了统计,表和图是图书管理员通过采集数据后,绘制的两幅不完整的频率分布表与频数分布直方图.请你根据图表中提供的信息,解答以下问题:

各种图书

频数

频率

自然科学

400

0.20

文学艺术

1000

0.50

社会百科

m

0.25

哲学


n

(1)表中m,n的值是多少?

(2)在图中,将表示“自然科学”的部分补充完整;

(3)若该学校打算采购一万册图书,请你估算“哲学”类图书应采购多少册较合适?

(4)根据图表提供的信息,请你提出一条合理化的建议.

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答案(点此获取答案解析)

解:(1)400÷0.20=2000,

m=2000×0.25=500,

n=1﹣0.20﹣0.5﹣0.25=0.05;

故答案为500,0.05;

(2)如图,

同类题1

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