12. [1.2/3.2 Points] DETAILS PREVIOUS ANSWERS MY NOTES PRACTICE ANOTHER 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. + Part (a) + Part (b) Part (c) If one of the trials is randomly chosen, find the probability that it lasted more than 28 days. (Round your answer to four decimal places.) 0.8051 X Sketch the graph. 10 20 30 40 10 20 30 40 10 20 30 40 10 20 30 40 Write the probability statement. Part (d) 64% of all trials of this type are completed within how many days? In other words, find the 64th percentile. (Round your answer to two decimal places.) days