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 (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | "Pilot" | Ron Hughart | Seth MacFarlane , Mike Barker & Matt Weitzman | February 6, 2005 | 1AJN01 | 15.10 |
| 2.0 | "Threat Levels" | Brent Woods | David Zuckerman | May 1, 2005 | 1AJN02 | 9.47 |
| 3.0 | "Stan Knows Best" | Pam Cooke | Mike Barker & Matt Weitzman | May 8, 2005 | 1AJN03 | 8.23 |
| 4.0 | "Francine's Flashback" | Caleb Meurer & Brent Woods | Rick Wiener & Kenny Schwartz | May 15, 2005 | 1AJN05 | 7.84 |
| 5.0 | "Roger Codger" | Albert Calleros | Dan Vebber | June 5, 2005 | 1AJN04 | 6.09 |
| 6.0 | "Homeland Insecurity" | Rodney Clouden | Neal Boushell & Sam O'Neal | June 12, 2005 | 1AJN06 | 6.85 |
Question:
How many different series numbers are there for the episode seen by 7.84 million people in the US?
Answer:
1.0