E(Q)=2/3 (in the class example)
P(H)=E(Q)=2/3
P(H2|H1)=P(H2&H1)/P(H2)
P(H2&H1)=integrate P(H)^2*fQ(q) from 0 to 1, which I got 1/2
P(H1) is just 2/3
SO final result is 3/4. Hope it's good
