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AQA · GCSE · Combined Science · Higher

Uncertainty from repeated density measurements

Q02.3 2 marks

The student is given a piece of a different plastic material.

The student determined the density of the material three times.

Table 2 shows the results.

Determine the uncertainty in the student’s results.

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Marking points

  1. 1 Find the range between the highest and lowest results, then divide by 2.
  2. 2 Give the uncertainty as 80 kg/m380\ \mathrm{kg/m^3}.

Full-mark answer

uncertainty=1120−9602=80 kg/m3\text{uncertainty}=\frac{1120-960}{2}=80\ \mathrm{kg/m^3}

Why this answer loses marks

160 kg/m³

This is the full range; the uncertainty is half the range.

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