probability - Proof explanation - weak law of large numbers

Let $(X_i)$ be i.i.d. random variables with mean $\mu$ and finite variance. Then $$\dfrac{X_1 + \dots + X_n}{n} \to \mu \text{ weakly }$$ I have the proof here: What I don't understand is, why it

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Solved 5. Weak Law of Large Numbers Use the inequality of

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The weak law of large numbers is a very strong

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By mimicking the proof of Theorem 8.7 (Weak Law of

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