My mac says that i have version 11.7.2 and i know there is no 11.7.2 and i cant download certain things like xcode

I can't download xcode because it says that ihave the wrong version please help

No idea how you managed to do that
But to set your OS X version number back to what it should be:
1. Open up the 'Terminal' app from /Applications/Utilites/
2. Type:      sudo pico /System/Library/CoreServices/SystemVersion.plist     followed by the return key
3. You will be prompted for your password. Type this in, again followed by the return key (you will not see anything as you input it in to the Terminal)
4. Scroll down with your arrow keys to where it says 11.7.2 (under 'ProductUserVisibleVersion' key)
5. Change the string value of the key to: 10.7.2
6. Scroll down with your arrow keys again to the other place (just below) where it says 11.7.2
7. Change the string value of the key to: 10.7.2
8. Press 'Ctrl + x' on your keyboard
9. Press 'y'
10. Press the return key
11. Quit Terminal
12. Restart your machine
13. Voila! - hopefully this should resolve your problem!
To check, once your Mac has restarted, press the Apple (using your mouse) in the top left hand corner of your screen, then press 'About This Mac', and you should see it no longer states you're using Mac OS X Version 11.7.2, but Mac OS X Version 10.7.2
Next steps......
1. Run a software update......
2. Open the Mac App Store and attempt to install Xcode again
Hope this helps!

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