Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 21 days and a standard deviation of 7 days. a. in words, define the random variable x. x = b. x∼ c. if one of the trials is randomly chosen, find the probability that it lasted at least 24 days. sketch the graph and write the probability statement. d. 60% of all of these types of trials are completed within how many days?