Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | " Pilot " | Ryan Murphy | Ryan Murphy, Brad Falchuk and Ian Brennan | May19,2009 | 1ARC79 | 9.62 |
| 2.0 | " Showmance " | Ryan Murphy | Ryan Murphy, Brad Falchuk and Ian Brennan | September9,2009 | 1ARC01 | 7.50 |
| 3.0 | " Acafellas " | John Scott | Ryan Murphy | September16,2009 | 1ARC02 | 6.69 |
| 4.0 | " Preggers " | Brad Falchuk | Brad Falchuk | September23,2009 | 1ARC03 | 6.63 |
| 5.0 | " The Rhodes Not Taken " | John Scott | Ian Brennan | September30,2009 | 1ARC04 | 7.40 |
| 6.0 | " Vitamin D " | Elodie Keene | Ryan Murphy | October7,2009 | 1ARC05 | 7.28 |
| 7.0 | " Throwdown " | Ryan Murphy | Brad Falchuk | October14,2009 | 1ARC06 | 7.65 |
| 8.0 | " Mash-Up " | Elodie Keene | Ian Brennan | October21,2009 | 1ARC07 | 7.15 |
| 9.0 | " Wheels " | Paris Barclay | Ryan Murphy | November11,2009 | 1ARC08 | 7.53 |
| 10.0 | " Ballad " | Brad Falchuk | Brad Falchuk | November18,2009 | 1ARC09 | 7.36 |
| 11.0 | " Hairography " | Bill D'Elia | Ian Brennan | November25,2009 | 1ARC10 | 6.17 |
| 12.0 | " Mattress " | Elodie Keene | Ryan Murphy | December2,2009 | 1ARC11 | 8.15 |
| 13.0 | " Sectionals " | Brad Falchuk | Brad Falchuk | December9,2009 | 1ARC12 | 8.13 |
| 14.0 | " Hell-O " | Brad Falchuk | Ian Brennan | April13,2010 | 1ARC13 | 13.66 |
| 15.0 | " The Power of Madonna " | Ryan Murphy | Ryan Murphy | April20,2010 | 1ARC14 | 12.98 |
| 16.0 | " Home " | Paris Barclay | Brad Falchuk | April27,2010 | 1ARC15 | 12.18 |
| 17.0 | " Bad Reputation " | Elodie Keene | Ian Brennan | May4,2010 | 1ARC16 | 11.62 |
| 18.0 | " Laryngitis " | Alfonso Gomez-Rejon | Ryan Murphy | May11,2010 | 1ARC17 | 11.57 |
| 19.0 | " Dream On " | Joss Whedon | Brad Falchuk | May18,2010 | 1ARC18 | 11.47 |
| 20.0 | " Theatricality " | Ryan Murphy | Ryan Murphy | May25,2010 | 1ARC20 | 11.37 |
| 21.0 | " Funk " | Elodie Keene | Ian Brennan | June1,2010 | 1ARC19 | 9.02 |
Question:
How many million U.S. viewers watched episode number 6 in the series?
Answer:
7.28