Bounds

genji

New member
Joined
Dec 17, 2020
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3
Hi there,

I'm currently going through a review worksheet and running into a couple of questions.

For the question:

Let Xn be the sum of n independent fair die rolls:
1) Find the largest constant α such that limn→∞ P(Xn ≥ αn) > 0.
2) For the α above, find the largest constant β such that limn→∞ P(Xn > αn + nβ ) > 0.

My thinking is: given n independent fair die rolls, the highest sum possible is 6n. Therefore, α should be 6, because the probability of hitting P(Xn ≥ 6n) is still > 0.

However, I don't quite understand how to answer the second problem.

Any help would be greatly appreciated!
 
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