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
Ask a new question for Free
By Image
Drop file here or Click Here to upload
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
-
Suitable Grade Level
Advanced High School
Related Recommendation
Grouped Data: Calculating Mean, Median, Mode, and Standard Deviation for Central Tendency
Mean, Variance, and Standard Deviation of Discrete Random Variables
Calculate Mean, Median, Mode, Variance, and Standard Deviation for Population Data
Calculate Mean, Median, Mode, Variance, and Standard Deviation for Hours Worked
Calculating Mean, Median, and Trimmed Mean for Cyclists' Power Data