6. [-/10.5 Points] DETAILS ILLOWSKYINTROSTAT1 7.2.073.HW. MY NOTES ASK YOUR TEACHER Suppose that the duration of a particular type of criminal trial is known to have a mean of 15 days and a standard deviation of 5 days, We randomly sample 9 trials. Part (a) In words, define the random variable EX the total number of days for the nine trials the total number of each type of trial the total number of hours for the nine trials the total number of all trials Part (b) Give the distribution of EX. Part (c) Find the probability that the total length of the 9 trials is at least 171 days, (Round your answer to four decimal places.) Part (d) Seventy percent of the total of 9 of these types of trials will last at least how long? (Round your answer to two decimal places.) days Submit