12. [4/5 Points] DETAILS PREVIOUS ANSWERS DEVORESTAT9 4.E.061.MI. MY NOTES ASK YOUR TEACHER Data collected at an airport suggests that an exponential distribution with mean value 2.675 hours is a good model for rainfall duration. (a) What is the probability that the duration of a particular rainfall event at this location is at least 2 hours? At most 3 hours? Between 2 and 3 hours? (Round your answers to four decimal places.) at least 2 hours 0.4735 0.6742 at most 3 hours between 2 and 3 hours .1477 (b) What is the probability that rainfall duration exceeds the mean value by more than 4 standard deviations? (Round your answer to four decimal places.) 0.0000 What is the probability that it is less than the mean value by more than one standard deviation? 0