一位面粉批发商统计了前48个星期的销售量（单位：吨）：24.4,19.1,22.7,20.4,21,22.8,20.9,21.8,18.6,24.3,20.5,19.7,23.5,21.6,19.8,20.3,21.9,22.3,21.4,19.2,23.5,20.5,22.1,22.7,23.2,21.7,21.1,23.1,23.4,23.3,21,24.1,18.5,21.5,24.4,22.6,21,20,20.7,21.5,19.8,19.1,19.1,22.4请将数据适当分组,列出频数分布表,画出频数分布直方图和频数折线图,并分析这位面粉批发商每星期进面粉多少吨合适?
问题描述：
一位面粉批发商统计了前48个星期的销售量（单位：吨）：
24.4,19.1,22.7,20.4,21,22.8,20.9,21.8,18.6,24.3,20.5,19.7,23.5,21.6,19.8,20.3,21.9,22.3,21.4,19.2,23.5,20.5,22.1,22.7,23.2,21.7,21.1,23.1,23.4,23.3,21,24.1,18.5,21.5,24.4,22.6,21,20,20.7,21.5,19.8,19.1,19.1,22.4请将数据适当分组,列出频数分布表,画出频数分布直方图和频数折线图,并分析这位面粉批发商每星期进面粉多少吨合适?
答
：（1）如图：
（2）由频数折线图,得（19×6+20×7+21×9+22×12+23×8+24×6）÷48=1035÷48=21.5625,
所以这位面粉批发商每星期进面粉21.6吨比较合适．