The fountains of bellagio" is a choreographed water display set to light and music that takes place in front of the bellagio hotel in las vegas. in the evening, the shows take place every 15 min from 7 p. m. to midnight. the duration of each show is 7 min. if joan arrives at a random time between 8 p. m. and 8: 30 p. m. for an evening show, find the probability that joan will have to wait the following.