To minimize the expected lifetime cost, we should choose the hybrid model. However, these expected values are so
close that they are effectively equal, given uncertainty in the price of gas. Thus, if total miles driven over the lifetime of
each vehicle (4 years) is 60,000, then the expected lifetime cost of both actions (given the assumed probability
distribution) is approximately equal.
Finally, note that basing the decision solely on expected value (in this case, lifetime cost) ignores the risk preferences of
the decision-maker. The decision table presented above in part 5 can be used to facilitate this discussion.