Tired and feeling dumb...maths question....

Hey, At this stage am pretty much brain dead and getting a simple percentage is too much for me now. Basically, I have these two fields: $pic_no_of_votes $vote_total_pts and this totals them up and keeps the average: $average_pts people vote on a scale of 1-5, so the average should be between 1-5 (right?? am not even sure of this!) I was thinking of rounding it with a 2 decimal point...eg: round(5.045, 2) Just need to solve this and them am hitting the sack, any help appreciated. Thanks, Ryan