各位高手好 小女子实在没有这方面的基础 面对这题问题 完全不知道该如何下手... 不知道是否有人能够替我详细解答呢? 若有高手愿意帮忙 小的愿意包个两千p币的红包给大大 表达我的谢意>"< 这已经是我所有的财产了 还希望大大们不要嫌礼物太轻...orz 非常谢谢!! The Lower Colorado River Authority (LCRA) has been studying congestion at the boat-launching ramp near Mansfield Dam. On weekends, the arrival rate averages 5 boaters per hour, Poisson distributed. The average time to launch or retrieve a boat is 10 minutes, with negative exponential distribution. Assume that only one boat can be launched or retrieved at a time. a. The LCRA plans to add another ramp when the average turnaround time (i.e., time in the system) exceeds 90 minutes. At what average arrival rate per hour should the LCRA begin to consider adding another ramp? b. If there were room to park only 2 boats at the top of the ramp in preparation for launching, how often would an arrival find insufficient parking space? --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 210.209.135.70