A random variable X given in the probability distribution below is the number of persons entering the bank every hour during a span of one week which were recorded by the security guard. a) What is the expected number of persons entering the bank every hour during that week? b) Compute the variance and standard deviation by illustrating its calculation step by step. x 1 2 3 4 P(x) 0.10 0.20 0.45 0.25

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