Let X = the time between two successive arrivals at the drive-up window of a local bank. If X has an exponential distribution with ? = 1, (which is identical to a standard gamma distribution with ? = 1), compute the following. (If necessary, round your answer to three decimal places.)

Let X : the time between two successive arrivals at the drive-up window of a local bank. IfX has an exponential distribution with l : 1, (which is identical to a standard gamma distribution with a : 1), compute the following. (If necessary, round your answer to three decimal places.) (a) The expected time between two successive arrivals :l (b) The standard deviation of the time between successive arrivals :l (c) p(x s 3) :l (d) p(2 5 XS 5) :I You may need to use the appropriate table in the Appendix of Tables