Thanks to a report made public by Distimo, company that describes itself as “an innovative app store analytics company built to solve the challenges created by a widely fragmented app store marketplace filled with equally fragmented information and statistics,” we now know the answer to the following two questions:

1. How much do Windows Phone 7 Marketplace apps cost on average? The answer is $1.95; the about 3.000 apps hosted by Microsoft’s Windows Phone 7 Marketplace, on average, cost $1.94.
2. How much do apps hosted by Apple’s App Store cost on average? The answer is $4; the 300.000+ apps hosted by Apple’s App Store, on average, cost $4.

The report allows us to provide an answer to another question – which are the most popular paid apps in Apple’s App store, Google’s Android Market, BlackBerry’s App World, Nokia’s Ovi Store, Palm’s App Catalog, and Microsoft’s Windows Phone 7 Marketplace. Or at least which apps were the most popular during the month of October, 2010.

Here are the most popular paid apps hosted by the biggest app stores out there.

Top 10 Most Popular Paid App Store Apps (for iPad)

1. Cut the Rope HD
2. Pages
3. Angry Birds HD
4. Friendly for Facebook
5. Angry Birds Halloween HD
6. Skee-Ball HD
7. Numbers
8. GoodReader for iPad
9. Keynote
10. StarWalk for iPad – interactive astronomy guide

Top 10 Most Popular Paid App Store Apps (for iPhone)

1. Angry Birds
2. Cut the Rope
3. Angry Birds Halloween
4. Fruit Nina
5. Trainyard
6. Doodle Jump - BE WARNED: Insanely Addictive!
7. Ringtone Maker Pro - Create free ringtones with your music!
8. Family Feud
9. Bejeweled 2 + blits
10. Cartoon Wars 2: Heroes

Top 10 Most Popular Paid Android Market Apps

1. Beautiful Widgets
2. SwiftKey Keyboard
3. WeatherBug Elite
4. Weather & Toggle Widget
5. DocumentsToGo Full Version Key
6. MyBackup Pro
7. SetCPU for Root Users
8. PicSay Pro – Photo Editor
9. Talking Tom Cat
10. ROM Manager (Premium)

Top 10 Most Popular Paid BlackBerry App World Apps

1. PhotoClub - Funny Make Machine With Photos
2. One Touch Flashlight (Uses Camera Light)
3. MemoryBooster - RAM Optimizer
4. Azure - MMMOOO Masterpiece
5. Color Woody V2
6. Juicy Girl Theme - On Sale!
7. Ultra Today Plus - Display all today plus without hovering on
8. BeBuzz - LED Colors and Audible Reminders
9. Upgrade your homescreen to Sky2 LiveScreen
10. Scanner Radio

Top 10 Most Popular Paid Windows Phone 7 Marketplace Apps

1. Bejeweled LIVE
2. Need for Speed Undercover
3. Flight Control
4. The Harvest
5. Earthworm Jim HD
6. De Blob
7. Star Wars: Battle for Hoth
8. Frogger
9. Tetris
10. Max & the Magic Marker

Please note that the top 10s presented above apply to the month of October, 2010. The App Store and Android Market top 10s were based on US app popularity; the other tops were based on international app popularity.

You can download Distimo’s report here.