A: Rarely. Most banking apps now require Android 5.0+ due to security patches. You may need to use mobile web banking instead.
Not every Play Store APK works on Jelly Bean. After API level 21 (Android 5.0 Lollipop), Google began designing Play Store versions that break on older runtimes. Based on user reports and compatibility testing, the versions for Android 4.2.2 are: google play store android 42 2 apk top
Below is a full breakdown and review of this version's performance and compatibility. A: Rarely