As far as the prediction goes I think Tommy's pretty accurate.
That being said, downvoting Inspectorfletcher is uncalled for. He took a guess trying to answer someone's question, which is all people can really do on this board. I've upvoted the post to balance the undeserved negvote, not because I agree with what is posted. People that want your score predicted, don't downvote people that are trying to help, otherwise go do it yourself.
like 15-23
WTF ? ARE U EFFING SRS? ITS THAT HARD TO GET A 25? WAT THE FARK YOU BETTER BE SURE MATE.
He better be sure or else what? Try to talk to people with more respect, and if you weren't intending to come off that way maybe double-check your posts before you post them. Don't mar an otherwise very friendly and helpful community with phrases like "wat the fark you better be sure mate."
Inspectorfletcher -> you could verify your guess with the formula x-avg/SD. We know that the SD of a study score is 7, the average is 30 and x is 15 in your case. This gives us -2.14 standard deviations away from the mean which would put him in the lowest 4% of the state on estimation -> an unreasonable percentage considering 50% of people get above or below a C+. A 23 is a lot more reasonable. Efforts are admirable but it's best to be sure when you're potentially going to heavily demotivate someone by making them think their best effort will net them a 15.
like 15-23
Lol ok year 10 I don't think you should predict study scores for anyone... 15? Jesus
~25
Lay off. All year levels are welcome. Don't use someone's year level as a put down.