Based on an analysis of sample data, an article proposed the pdf f(x) = 0.45e^(-0.45(x - 1)) when x ≥ 1 as a model for the distribution of X = time (sec) spent at the median line. (Round your answers to three decimal places.) (a) What is the probability that waiting time is at most 8 sec? More than 8 sec? (b) What is the probability that waiting time is between 6 and 7 sec?
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