solution Let G_1G1 and G_2G2 be the two subgroups.Given:P(G_1)=0.6~~~~P(G_2)=0.4~~~~P(A|G_1)=0.3~~~~P(A|G_2)= 0.5P(G1)=0.6 P(G2)=0.4 P(A∣G1)=0.3 P(A∣G2)=0.5Answer0.38