A college offers shuttle service from Olney Hall or Lot B to its campus quad. Both shuttles first depart their locations at 9:15 A. M. They run from each location to campus and back at the intervals shown. When is the next time both shuttles will depart for Campus at the same time?

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. the design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 99% confidence interval estimate of μ, the mean duration of game play. 4028 4316 4816 4650 4036 5010 4833 4331 4307