How to create a weighted average?

Question

Hi,
I am trying to create a grade book spreadsheet. The children will score a level from 1 - 5 in each subject. I am however running into a problem as far as one foreign language is concerned. Here - each strand of the subject (oracy, reading and writing) is weighted. Oracy accounts for 70% of the final (1-5) level, and reading and writing 15% apiece. To get a level for this subject I need a weighted average! How?!? Any advice would be appreciated. Thanks

Answer 1

Gwen,
It never hurts to start a new topic. With self-contained topics, the entire discussion will pertain to the Subject line of the topic and the particular answer that solves the question should be marked with a star so that others can quickly jump to the response that was most helpful. The person who posted the question sees two extra buttons, next to the "reply" link, that when clicked mark the response as helpful or solved, so that others will see the star icon that distinguishes the answer.
If you add a column before col B and format it as checkbox, the following expression in the footer cell of the new column b will give you the % special ed.: =COUNTIF(B,TRUE)/COUNTA($A)
Regards,
Jerry