This straightforward method is called a linear scale or curve formula. It is a very versatile way of using a curve and can be used to give an extra boost to the weakest students and can be used to adjust the mean to be a target value. This Excel sheet does all the "math" for you. If you need to justify its use to students or administrators, the Excel file explains and shows the formula being used. I use linear curves for all my advanced or challenging assessments. I will pick the highest and low