1000名考生的数学成绩近似服从正态分布N（100，225），则成绩在130分以 发布时间：2017-05-12 18:27 │ 来源：www.tikuol.com 题型：填空题 问题： 1000名考生的数学成绩近似服从正态分布N（100，225），则成绩在130分以上的考生人数约为______．（注：正态总体N（μ，σ2）在区间（μ-2σ，μ+2σ）内取值的概率为0.954）
题型：填空题 同义句转换。1. He didn't take part in the sports meeting because he was ill. He didn't take part in the sports meeting ______ ______ his illness. 2. She said she was an artist, but actually she was a liar. She said she was an artist, but ______ ______ ______, she was a liar. 3. He commanded that we (should) set out at once. He commanded us ______ ______ ______ at once. 查看答案