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Calculating the frieghters loading capacity

Question:

A freighter has to be loaded with 2000 tons of hard coal. The coal arrives at the harbor by railway carriages each of which holds independently of each other a random load X with E(X) = 50 and Var(X) = 64. What is the smallest number of ra n = nmin ilway carriages which are necessary to make sure that with a probability of not less than 0.99 the freighter can be loaded with at least 2000 tons of coal?

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