There are more people out there that are missing bones than those who have excess. Therefore , the average human does not have enough bones to make a full skeleton (the median would).
But there are also pergerante pregnant women, which raise the number of bones inside a person 🤔
There are about 130,000,000 birth’s per year. Assuming a word population of 8 billion and that an unborn baby has all its bones for 7/12 months, this increases the average number of bones inside humans by ~1%.
This would compensate 10% of the population, missing 10% of their bones. If you assume only 3.5/12 months, it’s still 10% missing 5%.
If that is correct, I would assume that the OP is correct, too.