Plz help A rock climber makes several changes in position while attempting to scale a
cliff face. She ascends 15 feet, descends 7 feet, ascends 22 feet, descends
13 feet, and then ascends another 28 feet. What is her mean change in
position?

The length of time for one individual to be erved at a cafeteria is a random variable having an ex- ponential distribution with a mean of 4 minutes. what is the probability that a person will be served in less than/3 minutes on at least 4 of the next 6 days?