The weights of five grapefruits are 7.47 ounces, 7.23 ounces, 6.46 ounces, 7.48 ounces, and 6.81 ounces. Using the clustering estimation technique, what is the approximate total weight of the grapefruits?

The weights cluster around 7 ounces each: 7.47, 7.23, 6.46, 7.48, and 6.81 are all reasonably close to 7. Estimating each grapefruit at 7 ounces gives 5 × 7 = 35 ounces, so the approximate total is 35 ounces.

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