13-9. A messenger service van completes its route every 90 minutes. For n = 15 runs of this route the number of items picked up for delivery was:

23 28 15 40 27 14 16 12 23 36 26 33 24 31 44 Is there reason to believe that the median number of items accepted for delivery/run exceeds 25? Use α = 0.05 to perform Wilcoxon’s signed rank test.