Each segment of an oil pipeline is 30 feet long. If a segment of the pipeline leaks, repair workers reach the leak by opening the pipeline at the nearest end of the segment. The probability of a leak is distributed continuously and iformly through each segment a. How far can repair workers expect to travel to reach a leak? b. Determine the probability repair workers will travel at least nine feet to reach a leak. c. There is a 0.25 probability repair workers will travel between three-and-a-half [or 3.5] feet and how many feet to reach a leak?