Math Problem Statement
例2、某机械企业在下料时需要把长度为L的钢材截成长度为L1和L2的两段,已知L服从均值为10cm,标准差为0.4cm的正态分布,L1服从均值为5cm,标准差为0.3cm的正态分布,则关于L2的分布,下列说法正确的是( C ) A. 一定不是正态分布 B. 服从均值为5cm,标准差为0.1cm的正态分布 C. 服从均值为5cm,标准差为0.5cm的正态分布 D. 服从均值为5cm,标准差为0.7cm的正态分布
Solution
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Math Problem Analysis
Mathematical Concepts
Normal Distribution
Sum and Difference of Normal Distributions
Formulas
Normal distribution properties for sum and difference
Theorems
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Suitable Grade Level
Advanced Mathematics
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