Phone conversation time is exponentially distributed with the mean equal to 3 minutes. What is the probability that a phone conversation will take 2 minutes and 59 seconds? Assume time measurement granularity equal to 1 second. Phone conversation time is exponentially distributed with the mean equal to 3 minutes. What is the probability that a phone conversation will take 2 minutes and 59 seconds? Assume time measurement granularity equal to 1 second.