I am creating a 'weekly average spreadsheet' (Excel 2007) for a teacher. It has a column for each student's name and his test grade for each day (M-F). The last column gives his weekly average.

She also needs an average for all the students' for the week (vertically). My formula is correct, i.e., =AVERAGE(H2:H11). However, I'm getting a divide by zero error because I have some blank rows above my formula (so she can add new students' names as they come.

How can I get rid of the divide by zero error so she can see the running averages as she inputs grades (but still leaving empty rows for new names)?

Thanks so much for your help!