习题3.11 查表计算:-|||-(1) df=5 时, (tleqslant -2.571)=?P(tgt 4.032)=??-|||-(2) df=2 时, ((x)^2leqslant 0.05)=?P((x)^2gt 5.99)=?P(0.05lt (x)^2lt 7.38)=??-|||-(3) (f)_(1)=3, (f)_(2)=10 时, (Fgt 3.71)=?P(Fgt 6.55)=??