Query 1700Q: Percentage of pupils on roll for whom ethnicity has not been obtained is high (greater than 10%)

This would indicate that at least 10% of your students do not have ethnicity recorded.  To add this in bulk please go to Admin > Students > Group Updater changing the student attribute to Ethnicity.  Once you have a list of all students you can then choose an ethnicity from the dropdown at the top next to check all and tick any students that have this ethnicity and update at the bottom once complete.  You would then do this for any other ethnicities required.