For independent X ~ N(10, 3), Y ~ N(8, 4), X − Y has SD
- Acheck_circle
5
- B
1
- C
7
- D
−1
Explanation
Var(X−Y) = 9 + 16 = 25; SD = 5.
Combining Random Variables
AP Statistics· difficulty 4/5
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AP Statistics· difficulty 4/5
For independent X ~ N(10, 3), Y ~ N(8, 4), X − Y has SD
5
1
7
−1
Explanation
Var(X−Y) = 9 + 16 = 25; SD = 5.
Want 10 more like this — adaptive to your weak spots?