
Under points to be notes the 1st rule says that the even number rule applies only when digit dropped is exactly 5 and how even 8.651 is also rounded off to 8.7
so similarly 7.654 should be rounded to 7.7 as 7.654 is visibly closer to 7.7 than 7.6 (Basic common sense)
This is a document I found from the Banaras Hindu University this can be used as proof maybe-https://www.bhu.ac.in/Content/Syllabus/Syllabus\_300620200426051350.pdf