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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">频率分布</h4><div class=\"download_card_msg\">0~90分,…,不及格的各占多少?此类问题如何解决?    对学生身高进行测量,得出一组数据,需了解140厘米以下,140~149厘米,150~159厘米,…,160~169厘米,170厘米以上的人数有多少?此类问题如何解决?    本课解决此类问题.    新课    在教师指导下,学生阅读并理解教材的内容.通过对这一引例的了解,得出此类问题的解题步骤:    (1)计算最大值与最小值的差.    (2)决定组距与组数.    (3)确定分点.    (4)列频率分布表.    (5)画频率分布直方图.。下面小编给大家分享频率分布，希望能帮助到大家。 频率分布文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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