Results 1 to 3 of 3

- Nov 21st 2008, 05:25 PM #1

- Joined
- Nov 2008
- Posts
- 2

## new mean from old mean

Lets say there's 10 people, each give a rating out of 10 for the new batman movie.The average from the 10 ratings are (sum/10) = 8.7

now one of those 10 changes his rating to a 8, is there are way to calculate the new average without having to go through all the data again?

what about if one of the 10 deleted his vote? so you have 9 votes now and the old average of 8.7?

I assume there is no quick fix solution other than to simply re calculate everything... the problem is that theres 50,000+ votes ..

- Nov 21st 2008, 10:59 PM #2

- Joined
- Nov 2005
- From
- someplace
- Posts
- 14,972
- Thanks
- 5

- Nov 22nd 2008, 12:22 AM #3