Janos P Toth is @tjp
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You have a fixed budget and two options for how to spend it. The first option is to spend half the money on development and testing, the rest on manufacturing and flight operations. If you take this choice, you get two rovers, each with a 90 percent chance of success. The other option is to spend three-quarters of the budget on development and testing, leaving a quarter for the actual mission. If you do it this way, you get just one rover, but it has a success probability of 95 percent. Which option should you choose? The right answer is to go for two rovers, because if you do it that way, you will have a 99 percent probability of succeeding with at least one of the vehicles and an 81 percent probability of getting two successful rovers—an outcome that is not even possible with the other approach.
— How Much Is an Astronaut’s Life Worth? - Reason Magazine
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