How much of the world's gold bullion does the federal reserve bank hold?

158,000 metric ton

The US Federal Reserve has about 8000 Tonnes of Gold or about 282192000 ounces. At todays prices that is in the neigborhood of 270 billion dollars. {| |}

approx. 7000 tons at ny fed reserve bank. only federal reserve bank to hold gold.

25%

No. It is a quasi-governmental organization involved in the fiscal operations of banks in the US.