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AQA · GCSE · Biology · Higher

Calculating a mean from measurements

Q01.3 2 marks

Students investigated the effect of temperature on the rate of photosynthesis. Table 1 shows the volume of oxygen produced per hour at different temperatures. X is the mean for 20 °C.

Calculate mean value X.

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Marking points

  1. 1 (18.5 + 19.3 + 19.5) / 3 or 57.3 / 3.
  2. 2 19.1 cm3/hour; allow an answer correctly calculated using only two correct values.

Full-mark answer

(18.5 + 19.3 + 19.5) / 3 = 57.3 / 3 = 19.1 cm3/hour.