Suppose that the duration of a particular type of criminal trial is known to have a mean of 18 days and a standard deviation of 6 days. We F Part (a) In words, define the random variable EX. O the total number of all trials O the total number of hours for the nine trials O the total number of each type of trial the total number of days for the nine trials Correct!*X represents the total time, in days, of all 9 trials. Part (b) Give the distribution of ΣΧ. EX-N ✓ Part (c) 9 X 18 Find the probability that the total length of the 9 trials is at least 194 days. (Round your answer to four decimal places.) 0 Part (d) Sixty 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

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