Table:
text: Canterbury's Law
U.S. Nielsen Ratings
Weekly ratings
Episode Air_Date Timeslot Rating Share_ _18_49_Rating_Share Viewers_m Rank_Timeslot Rank_Night Rank_Overall
Pilot March 10, 2008 8:00 P.M. 4.9 8 1.7/5 7.62 3 8 29
Baggage March 17, 2008 8:00 P.M. 3.6 6 1.7/5 5.66 4 11 57
What Goes Around... March 28, 2008 9:00 P.M. 3.3 6 1.2/4 4.87 4 7 70
Sweet Sixteen April 4, 2008 9:00 P.M. 3.9 7 1.4/4 6.07 3 5 48
Trade-Off April 11, 2008 9:00 P.M. 3.4 6 1.2/4 5.29 3 7 63
Sick as Your Secrets April 18, 2008 9:00 P.M. 3.2 6 1.0/4 4.68 3 8 68

Question: What is the average of shows that had a timeslot ranking greater than 3 but still had a smaller viewership rating of less than 4.87 for Canterbury's Law?