At the UXI Foundation, portfolio managers are normally kept on only if their annual rate of return meets or exceeds the mean annual return for portfolio managers of a similar investment style. Recently, the UXI Foundation has also been considering two other evaluation criteria: the median annual return of funds with the same investment style, and two-thirds of the return performance of the top fund with the same investment style.
The table below gives the returns for nine funds with the same investment style as the UXI Foundation.
Fund........................................Return (%)
1...............................................17.8
2...............................................21.0
3...............................................38.0
4...............................................19.2
5...............................................2.5
6..............................................24.3
7..............................................18.7
8..............................................16.9
9..............................................12.6
With the above distribution of fund performance, which of the three evaluation criteria is the most difficult to achieve?