Based on an analysis of sample data, an article proposed the pdf f(x) = 0.55e-0.55(x - 1) when x 2 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 7 sec? More than 7 sec? at most 7 sec P(X ≤ 7) = more than 7 sec P(X> 7) = (b) What is the probability that waiting time is between 6 and 7 sec?

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