问题
填空题
| 已知一组数据x1，x2，…，xn的方差是s2，则新的一组数据ax1+1，ax2+1，…，axn+1（a为常数，a≠0）的方差是______（用含a，s2的代数式表示）． （友情提示：s2=
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答案
∵一组数据x1、x2、x3…xn的方差是s2，
∴一组新数据ax1+1，ax2+1、ax3+1…axn+1的方差是a2•s2．
故答案为a2s2．
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| 已知一组数据x1，x2，…，xn的方差是s2，则新的一组数据ax1+1，ax2+1，…，axn+1（a为常数，a≠0）的方差是______（用含a，s2的代数式表示）． （友情提示：s2=
|
∵一组数据x1、x2、x3…xn的方差是s2，
∴一组新数据ax1+1，ax2+1、ax3+1…axn+1的方差是a2•s2．
故答案为a2s2．
| 根据短文内容，选词填空。 | |
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| Alice is from Australia. She 1 to our school yesterday. So our teacher let me 2 her around our school this morning. At about nine I 3 her at the gate. When she came, we walked into our school along the road. I introduced the teaching buildings, office buildings, the library, and the gym to her. When we finished 4 , she said that our school was very big and beautiful, and she liked it very much. She 5 she could study here all the time. |