I need to scale some tests. The highest grade is a 90 and the lowest is a 20. I want to scale them so that the lowest is a 60 and the highest is a 100. How do I make an equation that will do this? Thanks
Follow Math Help Forum on Facebook and Google+
Let's call the are the old scores and the are the new scores. We can make a linear relationship with the following co-ordinates (old , new) = and the equation will be in the form where giving now using to find the value for To scale future scores
Thank you very much, very clear and helpful. I should remember how to do that. I'm a university graduate. Darn.
Last edited by mr fantastic; Dec 28th 2010 at 06:06 PM. Reason: m --> r
The formula I am about to give you is not perfect, but I think it is decent. Let n=New Grade Let o=Old Grade The 20 will end up with a 60, but the 90 will end up with a 95. Sorry if it isn't what you're looking for. EDIT: too late
View Tag Cloud