ChaseDream
搜索
返回列表 发新帖
查看: 837|回复: 0
打印 上一主题 下一主题

求助 谁能帮忙解答下这道题~!!谢谢了~!!

[复制链接]
跳转到指定楼层
楼主
发表于 2009-11-18 17:12:41 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
上面是12个咖啡量的样本,都在8ounces左右。本人标准差这学的最差啊!
A vending machine is designed to dispense 8 ounces of coffee into a cup.  After a test that recorded the number of ounces of coffee in each of 1,000 cups dispensed by the vending machine, the 12 listed amounts, in ounces, were selected from the data.  If the 1,000 recorded amounts have a mean of 8.1 ounces and a standard deviation of 0.3 ounce, how many of the 12 listed amounts are within 1.5 standard deviations of the mean?

(A) Four
(B) Six
(C) Nine
(D) Ten
(E) Eleven

答案是E
收藏收藏 收藏收藏
您需要登录后才可以回帖 登录 | 立即注册

Mark一下! 看一下! 顶楼主! 感谢分享! 快速回复:

手机版|ChaseDream|GMT+8, 2025-6-11 20:10
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号

ChaseDream 论坛

© 2003-2025 ChaseDream.com. All Rights Reserved.

返回顶部