Please answer the following question with steps, thank you

A post ofce handles 10, 000 letters per day on average. 1. Use Markov's inequality to derive an upper bound on the probability that more than 12, 000 letters will be handled tomorrow. (You may leave your answer as a fraction.) [5 Marks] 11. Suppose the variance of letters processed is 2, 000. Use Chebyshev's inequality to de rive the range {both upper and lower bound} of the probability that this post ofce will handle between 3,000 and 12,000 letters tomorrow. (You may leave your answer as a fraction.) [5 Marks]