[yason]

As a general rule, consider number of installations akin to window shopping or browsing in a shop. Most of them will be followed by an uninstallation. The same install/uninstall churn will happen to several similar applications at the same time: when I'm looking for a good app, I might install 10 and uninstall 10, not having found a good one. I just took your product in my hand, wondered about it, and put it back on the shelf. Don't worry about it. I might not be your target segment anyway.

But should you convince me that your app might be worth its while we bump into the next hindrance.

As a general rule, things that make me abort the installation or uninstall right away:

- app crashes or has particularly custom or sluggish UI which stands out from the more modest applications on my phone

- app wants me to sign in to something

- app absolutely requires permissions I don't want to give

These can be born if the application is truly good (useful) and unique (can't go with another app). But most of these points prevent me from figuring out if the app is worth it.

And these all come into consideration only after I have positive expectations of why should I even try your app.

Considering the 20%, it could actually be quite high (depending on the context, app, and target audience of course).