Calculate the mean nitrate concentration found at site B. A scientist recorded the nitrate concentrations of the water at site A and site B. Her results are shown in the table. | site | nitrate concentration / mg per dm³ | |------|-----------------------------------| | A | sample 1: 17, sample 2: 25, sample 3: 18, mean: 20 | | B | sample 1: 49, sample 2: 64, sample 3: 58 |

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Calculate the mean nitrate concentration found at site B - Edexcel - GCSE Biology - Question 5 - 2014 - Paper 1

Question 5

Calculate the mean nitrate concentration found at site B. A scientist recorded the nitrate concentrations of the water at site A and site B. Her results are shown i... show full transcript

Worked Solution & Example Answer:Calculate the mean nitrate concentration found at site B - Edexcel - GCSE Biology - Question 5 - 2014 - Paper 1

Step 1

Calculate the total nitrate concentration at site B.

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Answer

Add the nitrate concentrations from all samples at site B:

$49 + 64 + 58 = 171$

Step 2

Calculate the mean nitrate concentration at site B.

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Answer

Divide the total by the number of samples (3):

$\text{Mean} = \frac{171}{3} = 57 \text{ mg per dm}^3$

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