Suppose that the duration of a particular type of criminal trial is known to have a mean of 24 days and a standard deviation of 8 days. We randomly sample 9 trials. Find the probability that the total...

Suppose that the duration of a particular type of criminal trial is known to have a mean of 24 days and a standard deviation of 8 days. We randomly sample 9 trials. Find the probability that the total length of the 9 trials is at least 247 days. (Round your answer to four decimal places.)