(a) What is the probability workers will load a truck in 10 minutes or less?
(b) What is the probability workers will load a truck in 30 minutes or less?
(c) What is the probability workers will load a truck in 20 minutes or more?
(d) What is the probability workers will load a truck in 35 minutes or more?
(e) What's the probability workers load a truck in between 15 & 25 minutes?