题目

Maciek Czastka was born in Lodz, Poland. He came to China several years ago. So far, he has been working in Chengdu for three years.“ The Belt and Road Initiative(“一带一路”的倡议)is meaningful, ” he said, “ Thanks to it, we are offered more chances. ” The most powerful support for Chengdu to thrive(兴盛)along the Belt and Road is the Chengdu-Europe express railway(高速铁路). It provides direct train services between Chengdu and the city of Lodz. Because of the express railway, trains can bring things from China to Europe. At the same time, they can bring b某商场为了调查旅游鞋的销售情况,随机抽取了40位顾客的购鞋尺寸,将所得数据整理后,画出频率分布直方图如下,其中直方图从左到右前3个小矩形的面积之比为1:2:3,试估计(1)购鞋尺寸在39.5~43.5内的顾客所占的百分比是多少?(2)样本数据的中位数是多少?(精确到0.01)
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