28. The interval from the smallest to largest amounts sold during the eight shifts in Exercise 37 is +1,889 to +4,592. If this range is treated as a nonparametric confidence interval for the median, what is the coverage probability of this interval?
29. The interval +750 to +2,250 excludes the largest and smallest trades executed at the office described in Exercise 38. If we treat this interval as a confidence interval for the associated population median, what's the coverage?