Table:
text: Friday Night Lights (U.S. ratings)
Weekly ratings
Season 2
Episode Air_Date Timeslot_EST Season Rating Share_ _18_49 Viewers_m Rank_
 I Knew You When  October 1, 2008 Fri. 9:00PM 2009 2.8 5 1.6 4.54 N/A
 Tami Knows Best  October 8, 2008 Fri. 9:00PM 2009 2.5 4 1.4 3.96 N/A
 How the Other Half Live  October 15, 2008 Fri. 9:00PM 2009 2.5 4 1.4 4.00 N/A
 Hello, Goodbye  October 22, 2008 Fri. 9:00PM 2009 2.5 4 1.4 4.21 N/A
 Every Rose Has Its Thorn  October 29, 2008 Fri. 9:00PM 2009 2.2 4 1.1 3.46 N/A
 It Ain`t Easy Being J.D. McCoy  November 5, 2008 Fri. 9:00PM 2009 2.5 4 1.4 3.93 N/A

text: Friday Night Lights (U.S. ratings)
Weekly ratings
Season 2
Episode Air_Date Timeslot_EST Season Rating Share_ _18_49 Viewers_m Rank_
 Keeping Up Appearances  November 12, 2008 Fri. 9:00PM 2009 2.6 5 1.5 4.22 N/A
 New York, New York  November 19, 2008 Fri. 9:00PM 2009 2.3 4 1.2 3.8 N/A
 Game of the Week  December 3, 2008 Fri. 9:00PM 2009 2.7 5 1.5 4.4 N/A
 The Giving Tree  December 10, 2008 Fri. 9:00PM 2009 2.5 4 1.2 3.84 N/A
 A Hard Rain`s Gonna Fall  December 17, 2008 Fri. 9:00PM 2009 2.5 4 1.2 3.95 N/A
 Underdogs  January 7, 2009 Fri. 9:00PM 2009 2.3 4 1.2 3.61 N/A
 Tomorrow Blues  January 14, 2009 Fri. 9:00PM 2009 2.6 5 1.3 4.36 N/A

Question: With a total viewership of 3.93 million and a share less than 4 for Friday Night Lights (US ratings), what is the average rating of viewers between the ages of 18 and 49 for a weekly episode of Season 2?