iPhone Users Download Average of 40 Apps, Android 25, BlackBerry 14

Simon Sage of IntoMobile reports on Nielsen’s findings :

iPhone users were the most active, with an average of 40 apps installed, while those with an Android phone had 25. BlackBerry trailed significantly with an average of 14 applications, and across all platforms

My questions is what are the numbers for paid downloads? Maybe iOS is just higher because there’s more free stuff.