DP Biology (first assessment 2025)

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Question 22M.2.SL.TZ1.1e

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.SL.TZ1.1e
Level SL Paper 2 Time zone TZ1
Command term Estimate Question number e Adapted from N/A
e.
[Maximum mark: 1]
22M.2.SL.TZ1.1e
(e)

The life expectancy of a human at the time of the study was 80 years. Estimate the porosity of the bones of the individual who was approximately 32 years old.

[1]

Markscheme

6 %;

Accept answers in the range 6.0 to 6.5 %.
Percentage sign required.

Examiners report

This question was very unusual in that the discrimination index was negative — stronger candidates were slightly less likely to answer correctly than weaker candidates, for reasons that are not obvious! Only a minority gave the expected answer of 6 %. A very common answer was 7 %, which is reached by calculating the age proportion correctly as 0.4 but using the trend line rather than the data point for the individual who was 32 years old. Careful reading of the question was needed to avoid this mistake.

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