As 5 possible outcomes,
W = 0,10,20,30,40
Then Expected Utility from each outcome
EU(0)= 0
EU(10)= 1/4
EU(20)= 1/2
EU(30)= 3/4
EU(40)= 1
So Expected Utility from lottery X
EU(X) = p +q/4
EU(Y) = (3/4)*(1/2)+(1/2)*(1/6)
= 3/8 + 1/12
= 11/24
A) x dominate over y, if
EU(X) > EU(Y)
p+q/4 > 11/24
& p+q= 1, p = 1-q
1-q+.25q > 11/24
1-11/24 > .75q
13/24 > .75q
q< .722
p> .278
b) y will dominate x , if
EU(Y) > EU(X)
p+q/4 < 11/24
q> .722
.722< q < 1
p < .278
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