According to an article in the
HuffintonPost Barbie would be: 5' 9", 39" bust, 18" waist, and 33" hips, with a size 3 foot.
I think the average woman is a size 14 at 5'6" but I don't have a reference for that.
Regardless it is an unrealistic image.
Along the same lines, I saw a great video/doc today called
Miss Representation. The video is about mid-screen.