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Learn the skill
Compare trials done under the same conditions. Calculate the mean by adding measurements and dividing by the number of trials. Report what the data supports without promising every future result.
Worked example
A model travels 6, 8, and 7 cm in three trials. Its mean distance is (6 + 8 + 7) divided by 3 = 7 cm.
Paper Glider Trials
Two paper glider designs were released from the same marked height by the same person indoors. Each used the same type and amount of paper. Design A traveled 4, 6, and 5 meters. Design B traveled 6, 7, and 8 meters. The class compared mean distance.