When I saw a problem on the site, it had a 2.6 rating. Since I really liked the problem, I voted 5 for it, and saw that the rating went from 2.6 to 2.75.
1) How many people voted for it before I did?
2)What would the rating of this problem be if two more people voted 5 for this problem?
15 people had voted on it. For it to have a rating a 2.6 it must have had a amount of ratings divisble by five, and 15 is the number that works.
For part two, the answer is 3. Once it was rated a 2.75 it had a total rating of 44 between 16 people. After two more 5's it would have a total rating of 54 between 18 people. 54/18 = 3.

Posted by Lewis
on 20030725 02:12:29 