X and Y are independent. SD(X) = 6, SD(Y) = 8.
What is SD(X - Y)?
- A
100
- B
14
- Ccheck_circle
10
- D
2
Explanation
Var(X-Y) = Var(X) + Var(Y) = 36 + 64 = 100. SD = 10.
Combining Random Variables
AP Statistics· difficulty 4/5
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