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Past exam of the mathematics course of the University of Cambridge / 2020 / ia / Paper 1 / 12F / b

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2020 ia Paper 1 12F
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b
The linear combination of independent normal random variables is normal. Hence
Sn​∼N(0,n),Un​=n​Sn​​∼N(0,1)​.
(1)
This also follows by multiplying the moment-generating functions of the independent and identically distributed random variables.

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