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Using data from Figure 14, calculate the difference in the population size from March to July - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1

Question 9

Using data from Figure 14, calculate the difference in the population size from March to July. Figure 14 shows the results. | month | number marked in the first sa... show full transcript

Worked Solution & Example Answer:Using data from Figure 14, calculate the difference in the population size from March to July - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1

Step 1

Calculate March Population Size

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Answer

To estimate the population size in March, we use the formula:

ext{population size} = rac{ ext{number marked in the first sample} imes ext{size of the second sample}}{ ext{number recaptured in the second sample}}

Substituting the values:

ext{population size} = rac{18 imes 22}{8} = 49.5 ext{ (approximately 50)}

Step 2

Calculate July Population Size

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Answer

For July, using the same formula:

ext{population size} = rac{12 imes 18}{10} = 21.6

Step 3

Calculate the Difference in Population Size

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Answer

The difference in population size from March to July is:

ext{Difference} = ext{Population size in March} - ext{Population size in July} = 50 - 21.6 = 28.4

Thus, the difference in the population size from March to July is approximately 28.4.

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