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How to use Chebyshev bound to achieve this question ? Let X be a Geometric random...

How to use Chebyshev bound to achieve this question ?

Let X be a Geometric random variable, with success probability p.
1) Use the Markov bound to find an upper bound for P (X ≥ a), for a positive integer a.
2) If p = 0.1, use the Chebyshev bound to find an upper bound for P(X ≤ 1). Compare it with the
actual value of P (X ≤ 1) which you can calculate using the PMF of Geometric random variables; what do you observe?

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