Expected utility is calculated by multiplying the utility of each possible outcome by its probability and summing the products. So if Terri has a 25% chance of becoming disabled and purchases a policy then her expected utility is: (.25 x $20,000) + (.75 x $80,000) = $5,000 + $60,000 = $65,000. On the other hand, if Terri does not purchase a policy then her expected utility is (.25 x $0) + (.75 x $80,000) = $0 + $60,000 = $60,000.