1 . 已知下列命题:
①在某项测量中,测量结果
服从正态分布
,若
在
内取值范围概率为
,则
在
内取值的概率为
;
②若
,
为实数,则“
”是“
”的充分而不必要条件;
③已知命题
,
,则
是:
,
;
④
中,“角
,
,
成等差数列”是“
”的充分不必要条件;其中,所有真命题的个数是
①在某项测量中,测量结果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833ca3490b9389617a2cd4f51d07eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29be23f689eb01e57963495377501257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66577f4cb97c0d2a213ab1a9a02d1324.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a4e7d0f505a532e4c89cbb7c734c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c257cdac5fe3f4136e9f329e62f2db9d.png)
③已知命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f02c864f2209da4a0c28bf7609d1bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04422e908e09c01e9e37cbbd84c16ca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d34a1cd162eae4dad33336b3b4329155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eceb820f88982531f74bba8b3aef767d.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b794fbafb7105576ac3f483b02027392.png)
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