So basically that Graph means close too nothing in terms of accurate data. Without data for every single person they are just making assumptions which could very likely be completely wrong assumptions.
"even it out" that is a massive assumption to say the least.
Even if it was only 50% of Australians deficient in vitamin d, this would still prove my point. Then again, even 20% would be enough to prove my point.
I know my effort is good, its great in fact and thankyou for highlighting this. I really appreciate that.