Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
新兵身高数据: sigma = 10 cm, n = 100 , \bar X = 165 cm。构造平均身高的95%置信区间。
新兵身高数据: sigma = 10 cm, n = 100 , \bar X = 165 cm。构造平均身高的95%置信区间。
Natural Language
Math Input
Extended Keyboard