1:1  10-12[文·数学]杨老师教大家看懂茎叶图，掌握概率计算
推荐理由：茎叶图是否都能看明白？能否根据图形进行平均数及方差的计算？此题涉及了统计图表背景下的概率计算，快来掌握吧！ 讲解人：杨老师，北京市骨干教师。培养的学生中有数百人次获得市级以上数学竞赛奖励。 题面：以下茎叶图记录了甲乙两组各四名同学的植树棵树.乙组记录中有一个数据模糊，无法确认，在图中以x表示.
(1)如果x=8，求乙组同学植树棵树的平均数和方差； (2)如果x=9，分别从甲、乙两组中随机选取一名同学，求这两名同学的植树总棵数不少于19棵的概率. 本部分内容设定了隐藏,需要回复后才能看到
 跟帖分享你的答案，即可看到正确答案和解析！别忘了回帖后再点进来查看答案哦~同学们，茎叶图都能看懂么？概率计算要掌握哦！ ------------------------------------------------------------------------------------------------------------------------------------------------------------------ [每周一星] http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=652796& 查看更多本年级每周一题，请点击：http://www.jiandan100.cn/bbs/upload/forumdisplay.php?fid=384& 浏览本期“简单学习电子周报”完整目录：http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=652770 |
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