Hi All

I'm still a noob in Excel although I have floundered around relatively succesfully for a while. I have a formula "=SUM(E28+F28+G28+H28)/(4)". If nothing is entered into cells E-H then a zero is displayed in the sum cell. I dont want to hide the cell or column, how can I get a blank cell / hide the '0' if no data is entered? Thanks