p= 1/3*3/5+2/5

1/3*3/5 is measured by choosing one of the half-breeds.

Two fifths of them are half-blood, counting the other two.

p=3/5

(2)

e 1 = 1 *( 1/5)+2 *( 1/5)+3 *( 1/5)+4 *(2/5)= 2.8

E2=2*(3/5)+3*(2/5)=2.4

e 1 & gt； E2