What would be the time gap between rotation of 2 or more ads?
Is there any relationship between ad serving(%)and impressions?
When you have say 2 ads, the "Optimize" feature in your campaign settings is off and both ads are approved each should receive about 50% of impressions. Due to the optimization of Adwords and review status of ads the percentage may not be the same.
Be also aware that if you are looking at a longer period the percentage shown may be relatively low for new ads that did not exist through the whole period.
Does this help?
