What is the average cost to add a 16 year old to auto insurance?

I am 16 and I am trying to get my parents to let me get my license and put me on the insurance, but they think it will cost to much. I know it will cost more, but I don't know how much and I have an A average at school and I am a girl so that has discounts. I asked the insurance place but they asked to many questions so if you have a rough estimate that would be great.