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- Prepare
- Artificial Intelligence
- Probability & Statistics - Foundations
- Standard Deviation Puzzles - 4
- Discussions
Easy problem, but if you answer as plain text, you need to select "Plain Text" in the dropdown list. I got it wrong twice with the right answer before realizing this.
By variance sum law: (SD of x-y)^2=(SD of x)^2 +(SD of y)^2
X and Y are random variables, not deviates. Deviate is the actual outcome of the variable.