Math Problem Statement
有一组数据,此数据中的每一个数据都乘以2再减去80,得到一组新的数据,已知新数据的平均数为1.2,方差是4.4,问原来的这一组数据的平均数和方差是多少
Solution
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Math Problem Analysis
Mathematical Concepts
Linear transformations
Mean and variance in statistics
Formulas
Linear transformation formula: Y = aX + b
Variance transformation formula: Var(Y) = a^2 * Var(X)
Theorems
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Suitable Grade Level
Advanced High School
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