About $1.48\times 10^8$ square kilometers of Earth's surface is land; the rest, about $3.63\times 10^8$ square kilometers, is water. If a returning space capsule lands at a random point on Earth's surface, which of the following is the best estimate of the probability that the space capsule will land in water?

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$$\frac{\text{water}}{\text{total}} = \frac{3.63\times 10^8}{1.48\times 10^8+3.63\times 10^8}$$ $$\approx 71\%$$