Math Problem Statement
M 公司生产垫片。在生产线上,随机抽取100 片垫片,发现其厚度分布均值为2.0mm,标准差为 0.2mm。取10 片叠起来,则这10 片垫片叠起来后总厚度的均值和方差为: A. 均值 2.0mm;方差0.2 B. 均值 20mm;方差0.04 C. 均值 20mm;方差0.4 D. 均值 20mm;方差4
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Math Problem Analysis
Mathematical Concepts
Statistics
Probability
Formulas
Sum of independent variances
Theorems
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Suitable Grade Level
Advanced Level
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