The time it takes for Marriott Marquis Chicago hotel guests to wait for an elevator is uniformly distributed between 15 seconds and 6.5 minutes. a) What is the probability that a guest waits between 1.2 minutes and 4.8 minutes for an elevator? (Round to 3 decimal places.) b) What is the variance of the wait times? (Round to 2 decimal places.) c) 21% of the time, the wait time for an elevator is less than k minutes. Find k. (Round to 2 decimal places.) minutes d) What is the probability that a guest waits more than 2 minute(s) for an elevator? (Round to 3 decimal places.) e) What wait time is exceeded by only 11% of the elevator wait times? (Round to 2 decimal places.) minutes