Answer: underperformed the market on a risk-adjusted basis.
Explanation:
A mutual fund manager is someone who implements a investment strategy for a fund and helps.in the management of the trading activities as well. They simply help in overseeing the mutual funds and also help in making vital decisions regarding such investments.
Given the vast resources available to mutual fund managers, these managers on average have generally underperformed the market on a risk-adjusted basis. They've not been able to beat the market while some have even run at a loss as they made bad investment decisions.