the probability mass function of a discrete random variable X representing the number of bicycles available at a docking station each morning was introduced. This p.m.f. is repeated here, in Table 2. Table 2 The p.m.f. of X 1 3 4 5 p(x) 0.3 0.2 0.2 0.1 0.1 0.05 0.05 (ii) What is the variance of the number of bicycles available at the docking station each morning?

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