Question: Mean SD X 350 30 Y 470 46 Two random independent variables: What is the standard deviation of SD(1.4X+0.6Y). I am confused about the notation

Mean SD
X 350 30
Y 470 46

Two random independent variables:

What is the standard deviation of SD(1.4X+0.6Y). I am confused about the notation for linear combination of random variables.

Is it:

  • SD(1.4X+0.6Y)=1.4(30)2+0.6(46)2))=50.29

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