Over a period of time like 30 years what percentage of actively managed funds perform better than an index fund diversified portfolio?

Actively managed funds perform 88.4% better than an index fund diversified portfolio

Explanation:

Actively managed funds perform 88.4% better than an index fund diversified portfolio. However, passive funds perform better than the  active funds eighty percent times.

The performance of an actively managed fund is better than the index fund diversified portfolio because it tries to  book losses that are less severe

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!