名校
解题方法
1 .
年辽宁、广东、河北、湖北、湖南、江苏、福建、重庆等八省市将全部采用“
”的新高考模式.“
”指的是语文、数学、外语,这三门科目考试参加统一高考,由教育部考试中心统一命题,以原始成绩计入考生总成绩;“
”指的是物理和历史中的一科,考生必须从物理和历史两个科目中选择一科,由各省自主命题,以原始成绩计入考生总成绩.为了让考生更好的适应新高考模式,某省几个地市进行了统一的高考适应性考试.在所有入考考生中有
人选考物理,考后物理成绩
(满分
分)服从正态分布
.
(1)分别估计成绩在
和
分以上者的人数;(运算过程中精确到
,最后结果保留为整数)
附1:
,
,
.
(2)本次考试物理成绩
服从正态分布
.令
,则
,若本次考试物理成绩的前
划定为优秀等级,试估计物理优秀等级划线分大约为多少分?
附2:若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151e5633a5d0cc30b254167e3dda5803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8e63a3de229aa35d7e95b166802303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef0b21734b3d6d9775cb88502df7923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70221a1cb5f906d512694f59d24ce0d.png)
(1)分别估计成绩在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2231c1ab41da94c5b3ebda2ded17c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86608326541db75771f5de9db6187e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4640ca711c05515aba71872889f5f5.png)
附1:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256181dd02e41f3a9eadf1de097f472e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cee36a73c750c9229a4a4f4683cbcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8978e75d27c4ccd0b211326ac932e17.png)
(2)本次考试物理成绩
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84c2c26cbb6b22a415fd0830401aeac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a082066f68298cac4807b5dcf70757c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2977cf9e10d626c65afd7d6aa8028d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2fa2c62d988b9c016b77a1f4be70e9.png)
附2:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/795ff2bb681d256ef6e21e47cabe0390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b36541082fde9213362901d60b7120.png)
您最近一年使用:0次
2021-09-02更新
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1303次组卷
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3卷引用:山东省青岛胶州市2020-2021学年高二下学期期中考试数学试题