4. Let X1, X20 be independent Poisson random variables with mean 1. (a) Use the Markov inequality...

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4. Let X1, X20 be independent Poisson random variables with mean 1.

(a) Use the Markov inequality to obtain a bound on

$$

P[\sum_{i=1}^{20} X_i > 15]

$$

(b) Use the central limit theorem to approximate

$$

P[\sum_{i=1}^{20} X_i > 15]

$$

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