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In which situation would calculating an average be most appropriate?

Answer and explanation

Correct answer: After measuring the same quantity several times

Direct answer: Option A, after measuring the same quantity several times. Repeated measurements of one quantity may differ slightly because of random variation or measurement limits. The arithmetic mean is found by adding all readings and dividing by the number of readings: \(\text{average}=\frac{\text{sum of readings}}{\text{number of readings}}\). It gives a representative central value, although original readings must also be kept. Option A is correct because several comparable measurements can be combined meaningfully. Option B is wrong because one colour description is qualitative and offers no set of numerical readings for an average. Option C is wrong because one personal opinion is not repeated measurement of a measurable quantity. Option D is wrong because one value without a unit is incomplete and cannot be interpreted reliably. Exam cue: repeat, record, then average with units.

Related tags

AverageRepeated-MeasurementRandom-VariationData-AnalysisScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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