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1.背景在一次模拟考试中,对一道概率题第(2)问的解答,同学们出现了一样期望值不一样解题过程的情况,许多同学因答案正确却丢分而愤愤不已。现将题目摘录如下:题目人民日报3月14日报道,中国人民银行已下通知,要求暂停二维码(条码)支付,虚拟信用卡等支付业务和产品。前不久,某调研机构调研了在校大学生网上购物情况,随机调查了16位在校大学生的网购比例(网上购物次数占总购物次数的比例),结果如茎叶图所示(图中茎7叶
1. Background In a mock exam, students’ answers to a probabilistic question (2) show that students do not have the same expectation value, and many of the students are outraged by the correct answers. The title is excerpted below: Subject People’s Daily reported on March 14 that the People’s Bank of China has issued a circular calling for the suspension of two-dimensional code (barcode) payment and virtual credit card payment services and products. Not long ago, a research agency surveyed online shopping of college students, randomly surveyed 16 online college students online shopping proportion (online shopping ratio of the total number of shopping), the results as shown in the stem and leaf diagram (Figure 7 leaf