A) Suppose X ~ N(-3, 1). Using the Empirical Rule,between what x values does approximately34.1% (or 34%)of the data lie?

a)-5, -3 or -3, -1

b)-6, -3 or -3, 0

c)-4, -3 or -3, -2

B) 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 seven days.

If one of the trials is randomly chosen, find the probability that it lasted at least 24 days.

Solution:Answer to 2 decimal places.