1. three out of every ten students
2. three of every ten students
The first one is a sentence in an article.
I just wonder if the second one is also correct to English native speakers. (Is the "out" really necessary?)
Are there other ways to say?
Thanks a lot.
We normally use 'out of'. You can omit the 'out' of you are talking about a specific mumber, rather than a fraction/percentage:
Only four of the twelve people questioned had actually seen the explosion.