I think it's five or six people.
4 seconds sound clip from the The Exorcist movie soundboard.
You can hear this line at 00:16:36 in the Blu-ray version of the movie.
Quote context
[...]
- What we got, anything exciting?
- And also, you got an invitation.
- You're kidding me. What is that, a big party or something?
- I think it's five or six people.
- Oh. Thursday, huh? All right.
- Hi, Mom. What'd you do today?
- Stuff. -What's that mean, stuff?
- Well, me and Sharon played a game in the backyard. You did.
- And we had a picnic down by the river.
[...]