The weights of five grapefruits are 7 point 4 7 ounces, 7 point 2 3 ounces, 6 point 4 6 ounces, 7 point 4 8 ounces, and 6 point 8 1 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 fairly 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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