the duration of a bike trip between the gym and his house follows an exponential law. This trip takes an average of 12 minutes twice a day. In the same day, these two durations are independent. What...

the duration of a bike trip between the gym and his house follows an exponential law. This trip takes an average of 12 minutes twice a day. In the same day, these two durations are independent. What is the linear correlation coefficient between the longest and the shortest displacement?