讲解一下这个题目的做法---```plain text C 素养发展创新练 8. [数据观念] (2023 聊城) 某中学把开展课外经典阅读活动作为一项引领学生明是非、知荣辱、立志向、修言行的德育举措.为了调查活动开展情况,需要了解全校 2000 名学生一周的课外经典阅读时间.从本校学生中随机抽取 100 名进行调查,将调查的一周课外经典阅读的平均时间 x(h) 分为 5 组: ① 1 ≤ x < 2; ② 2 ≤ x < 3; ③ 3 ≤ x < 4; ④ 4 ≤ x < 5; ⑤ 5 ≤ x < 6, 并将调查结果用如图 12-2-18 所示的统计图描述. 根据以上信息,解答下列问题: (1) 本次调查中,一周课外经典阅读的平均时间达到 4 h 的学生人数占被调查人数的百分比为 28 %. 估计全校一周课外经典阅读的平均时间达到 4 h 的学生有 560 人. (2) 若把各组阅读时间的下限与上限的中间值近似看作该组的平均阅读时间,估计这 100 名学生一周课外经典阅读的平均时间是多少? (3) 若把一周课外经典阅读的平均时间达到 4 h 的人数百分比超过 40% 作为衡量此次开展活动成功的标准,请你评价此次活动,并提出合理化的建议. Chart Description: * Type: Bar chart (specifically, a histogram where bars represent frequency distributions). * Title: 一周课外经典阅读的平均时间统计图 (One week extracurricular classic reading average time statistics chart) * X-axis: Label is x/h (reading time in hours). Scale is from 0 to 6, marked at intervals of 1 (0, 1, 2, 3, 4, 5, 6). The intervals correspond to the groups defined in the problem description. * Y-axis: Label is 频数 (Frequency). Scale is marked at intervals (possibly 10, but the numbers are 8, 10, 20, 26, 36). * Bars: * Interval 1 ≤ x < 2: Bar height corresponds to Frequency 10. * Interval 2 ≤ x < 3: Bar height corresponds to Frequency 26. * Interval 3 ≤ x < 4: Bar height corresponds to Frequency 36. * Interval 4 ≤ x < 5: Bar height corresponds to Frequency 20. * Interval 5 ≤ x < 6: Bar height corresponds to Frequency 8. * Other Labels: The y-axis tick marks are labeled 8, 10, 20, 26, 36. The x-axis tick marks are labeled 0, 1, 2, 3, 4, 5, 6. ```