Question:

Just outside of Vancouver is Grouse Mountain and it has a wonderful view of Vancouver and the surrounding area. You can take the ski-lift to the top (like I did) or you can hike up on a trail called "The Grinder". The webpage says that the Grinder is a 2.5 km trail that ascends 800 meters and it takes people an average (mean) of 135 minutes to climb it (assume a standard deviation of 45 minutes). If it took Andrew 72 minutes to climb this trail, what percentage people were faster than him?

b) Using the data from the previous question, what proportion of people take more than 234 minutes?